Core-M: Import CMSIS-Core(M) 5.0.5 (CMSIS 5.9.0)

This commit imports the CMSIS-Core(M) 5.0.5, which is part of the
CMSIS 5.9.0 release.

Origin: CMSIS_5
License: Apache-2.0
URL: https://github.com/ARM-software/CMSIS_5/tree/5.9.0


commit: 2b7495b8535bdcb306dac29b9ded4cfb679d7e5c
Purpose: Provide a hardware interface to the Arm Cortex-M architecture
Maintained-by: External

Signed-off-by: Marcin Niestroj <m.niestroj@emb.dev>