soc: arm: refactor MPU region for NXP S32Z/E

Currently, memory from  __rodata_region_end to __kernel_ram_start (or
_app_smem_start if config userspace) was uncovered by programable MPU
region. But to config static MPU region (nocache region is on ths
region), the programable MPU region need confg full patition.

Signed-off-by: Duong Vu Nam <duong.vunam@nxp.com>