cmsis: Import CMSIS-CORE header files

The ARM Cortex Microcontroller Software Interface Standard (CMSIS) defines a
set of standard interfaces to ARM Cortex-M SOCs. In particular, the CMSIS-CORE
component standardizes the software interface to core and peripheral registers,
as well as exception names and the system clock frequency. Multiple SOC
vendors, including NXP and Nordic Semiconductor, include the CMSIS-CORE header
files in their SOC header files. These SOC header files are in turn used by
the vendor's peripheral drivers.

Origin: ARM CMSIS v4.5.0
URL: https://github.com/ARM-software/CMSIS.git


commit: f25cf2c15304ad872a5b9761651d3f57d6202906
Maintained-by: External

Change-Id: I15c3ddd04619a7608fecb8b710eb115b30cd9632
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>