doc: Update documentations for CMSIS 5.7.0

https://github.com/ARM-software/CMSIS_5.git

The current version supported in Zephyr is

https://github.com/ARM-software/CMSIS_5/releases/tag/5.6.0

https://github.com/ARM-software/CMSIS_5/releases/tag/5.7.0

# CMSIS Version 5

The branch *master* of this GitHub repository contains the CMSIS Version 5.6.0.  The [documentation](http://arm-software.github.io/CMSIS_5/General/html/index.html) is available under http://arm-software.github.io/CMSIS_5/General/html/index.html

The branch *master* of this GitHub repository contains the CMSIS Version 5.7.0.  The [documentation](http://arm-software.github.io/CMSIS_5/General/html/index.html) is available under http://arm-software.github.io/CMSIS_5/General/html/index.html

Use [Issues](https://github.com/ARM-software/CMSIS_5#issues-and-labels) to provide feedback and report problems for CMSIS Version 5. 

|[Pack](http://arm-software.github.io/CMSIS_5/Pack/html/index.html)    | All Cortex-M, SecurCore, Cortex-A5/A7/A9 | Describes a delivery mechanism for software components, device parameters, and evaluation board support. It simplifies software re-use and product life-cycle management (PLM). |

|[SVD](http://arm-software.github.io/CMSIS_5/SVD/html/index.html)      | All Cortex-M, SecurCore | Peripheral description of a device that can be used to create peripheral awareness in debuggers or CMSIS-Core header files.|

|[DAP](http://arm-software.github.io/CMSIS_5/DAP/html/index.html)      | All Cortex | Firmware for a debug unit that interfaces to the CoreSight Debug Access Port. |

|[Zone](http://arm-software.github.io/CMSIS_5/Zone/html/index.html)    | All Cortex | Defines methods to describe system resources and to partition these resources into multiple projects and execution areas. |

|[Zone](http://arm-software.github.io/CMSIS_5/Zone/html/index.html)    | All Cortex-M | Defines methods to describe system resources and to partition these resources into multiple projects and execution areas. |

## Implemented Enhancements

 - CMSIS-Core-A, RTX5: implementation for Cortex-A5/A7/A9

 - Support for Armv8-M Architecture (Mainline and Baseline) as well as devices Cortex-M23 and Cortex-M33

 - CMSIS-RTOS2: RTX 5 is now available for IAR, GCC, Arm Compiler 5, Arm Compiler 6

 - CMSIS-RTOS2: FreeRTOS adoption (release) is available https://github.com/ARM-software/CMSIS-FreeRTOS

 - CMSIS-NN: Bare metal Neural Network function library.

 - CMSIS-DAP v2: with WinUSB for faster communication and separate pipe for SWO support

 - Config Wizard extension: access enum’s for configuration information 

 - CMSIS-Pack generation with [shell script template](https://arm-software.github.io/CMSIS_5/Pack/html/bash_script.html) for Windows and Linux

 - CMSIS-Pack: [Git workflow](https://arm-software.github.io/CMSIS_5/Pack/html/element_repository.html) via Eclipse menu *Window - Preferences - CMSIS Packs - Manage Local Repositories* and [MDK](http://www.keil.com/support/man/docs/uv4/uv4_ca_packinst_repo.htm)

 - [CMSIS-Zone release 1.0](https://arm-software.github.io/CMSIS_5/Zone/html/index.html) with support for multi-processor, TrustZone, and MPU configuration 

 - Support for Armv8.1M Architecture and Cortex-M55 (release in March 2020)

 - CMSIS-DSP is fully ported to SIMD for Cortex-M family (Armv8.1-M)  and Cortex-A & Cortex-R with NEON, using the same APIs.

## Further Planned Enhancements

 - CMSIS-Zone: management of complex system

 - CMSIS-Pack:

   - System Description SDF Format: describe more complex debug topologies than with a Debug Description in a tool agnostic way

   - Github based workflow: allows to develop software packs using github infra-structure

   - Flash algorithm via debugger: Some TurstZone enable devices cannot execute RAM. Commands that allow flash programming will be added to Debug Description.

   - CPDSC project file format: allows project templates that are agnostic of an IDE

   - Minimize need for IDE specific settings: CMSIS-Pack supports IDE specific parameters. Analyze and minimize 

 - CMSIS-Build: command-line driven make system for CMSIS-Pack based projects (to support CI tests)

For further details see also the [Slides of the Embedded World CMSIS Partner Meeting](https://github.com/ARM-software/CMSIS_5/blob/develop/CMSIS_EW2019.pdf).

For further details see also the [Slides of the Embedded World CMSIS Partner Meeting](https://github.com/ARM-software/CMSIS_5/blob/develop/CMSIS_Review_Meeting_2020.pdf).

## Other related GitHub repositories