soc: nxp: s32k3: use `MPU_REGION_ENTRY` macro #188783

Job	Run time
twister-build-prep	4m 10s
twister-build (5)	15m 31s
twister-build (4)	21m 35s
twister-build (1)	26m 1s
twister-build (3)	19m 47s
twister-build (6)	17m 16s
twister-build (2)	22m 26s
Publish Unit Tests Results	1m 18s
Check Twister Status / all jobs passed	3s
	2h 8m 7s

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