release-notes: Update and cleanup

Zephyr Kernel 1.6.0 Release Notes

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We are pleased to announce the release of Zephyr kernel version 1.6.0. This release introduces

a Unified Kernel replacing the separate nano- and micro-kernels, simplifying the overall Zephyr

architecture and programming interfaces. This release also enables USB mass storage, increases

board support for ARM Cortex-M0/M0+ family and includes numerous major features and bug fixes

described below. It also adds many improvements for documentation, build infrastructure, and

testing. The next three-month cadence release is planned for the end of February.

We are pleased to announce the release of Zephyr kernel version 1.6.0. This

release introduces a Unified Kernel replacing the separate nano- and

micro-kernels, simplifying the overall Zephyr architecture and programming

interfaces.

In this release we added support for the ARM Cortex-M0/M0+ family and expanded

board support for Cortex-M.

Additionally, this release adds many improvements for documentation, build

infrastructure, and testing.

Major enhancements included with the release:

* Introduced the Unified Kernel; the nano and micro kernel were removed.

* The legacy API is still supported but deprecated. All legacy tests were moved to tests/legacy.

* The legacy API is still supported but deprecated. All legacy tests were moved

  to tests/legacy.

* Added Unified Kernel documentation.

* Added support for several ARM Cortex-M boards

* Added support for USB mass storage access to the internal filesystem.

* Added support for USB mass storage and access to the filesystem.

* Added native Bluetooth Controller support. Currently nRF51 & nRF52 are supported.

A detailed list of changes since v1.5.0 by component follows:

* Removed deprecated Tasks IRQs.

* Removed deprecated dynamic interrupt API.

* Added DLIST to operate in all elements of a doubly-linked list.

* SLIST: Added sys_slist_get() to fetch and remove the head, also Added append_list and merge_slist.

* SLIST: Added sys_slist_get() to fetch and remove the head, also Added

  append_list and merge_slist.

* Added nano_work_pending to check if it is pending execution.

* Unified: Added support for k_malloc and k_free.

* Renamed kernel objects event to alert and memory map to memory slab.

* Ethernet: Added KSDK shim driver.

* Flash: Added KSDK shim driver

* I2C: Changed config parameters to SoC specific.

* QMSI: Implemented suspend and resume functions in WDT, I2C, SPI and AONPT.

* QMSI: Implemented suspend and resume functions QMSI shim drivers

* Added HP206C sensor.

* Changed config_info pointers to const.

* Added support for SoCWatch driver.

Networking

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* [Content: component changes]

* Minor fixes to uIP networking stack (This will be deprecated in 1.7)

Bluetooth

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HALs

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* QMSI: Updated to version 1.3.

* QMSI: Updated to version 1.3.1.

* HAL: Imported CC3200 SDK.

* Imported Nordic MDK nRF51 files.

* Imported Kinetis SDK Ethernet phy driver.