soc: arm: add mpu REGION_FLASH_SIZE definitions for larger flash regions
soc: arm: add mpu REGION_FLASH_SIZE definitions for larger flash regions

Add MPU REGION_FLASH_SIZE definitions for 128M-512M flash sizes, to handle
arm SOCs with large flash regions.

Signed-off-by: Daniel DeGrasse <002dd1d4ac44ebb71088aae93501e62b784ed821@nxp.com>

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