Backport CMSIS_6#102 to CMSIS 5.9.0

Currently CMSIS 5 is broken with the IAR compiler, and will not be patched.
I tried lifting zephyr to CMSIS 6 but this was non-trivial.

One way to fix this without ugly kludges inside zephyr
is backporting the fix from
zephyrproject-rtos/CMSIS_6/commit/db3f1703087023f67465bbd338509e2d5322746c
fix to CMSIS 5.9.0.

Signed-off-by: Robin Kastberg <robin.kastberg@iar.com>