arch: arm: core: aarch32: Updated brief file description
arch: arm: core: aarch32: Updated brief file description

Updated brief file description so that it also mentions the aarch32
Cortex-A CPUs.

Signed-off-by: Immo Birnbaum <9d53277017f7b972042afc81794f782b84cac388@weidmueller.com>

finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr