arch: arm: aarch32: ARM_STORE_EXC_RETURN only applies to Cortex-M
arch: arm: aarch32: ARM_STORE_EXC_RETURN only applies to Cortex-M

Cortex-M code is the only flavor that supports switching between secure
and non-secure state so make sure this kconfig only applies to it.

Signed-off-by: Bradley Bolen <a46f022a58b40f08f87b914d58da7dec46dba40c@lexmark.com>

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