tests: code_relocation: support mr_canhubk3 boards

Add test scenario for NXP S32 platforms, for now only ported to
mr_canhubk3.

In some platforms the MPU region used for NULL pointer detection
conflicts with the ITCM region, causing access fault. Make disabling the
null pointer exception detection the default behavior for this scenario.

Signed-off-by: Manuel Argüelles <manuel.arguelles@nxp.com>

tests/application_development/code_relocation/testcase.yaml

@@ -15,6 +15,14 @@ tests:
       - CONFIG_MPU_ALLOW_FLASH_WRITE=y
     platform_allow:
       - frdm_k64f
+  tests.application_development.code_relocation.nxp_s32:
+    filter: not CONFIG_CPU_HAS_NXP_MPU and CONFIG_MINIMAL_LIBC and dt_chosen_enabled("zephyr,itcm")
+    arch_allow: arm
+    extra_configs:
+      - CONFIG_RELOCATE_TO_ITCM=y
+      - CONFIG_NULL_POINTER_EXCEPTION_DETECTION_NONE=y
+    platform_allow:
+      - mr_canhubk3
   tests.application_development.code_relocation.no_itcm:
     filter: not CONFIG_CPU_HAS_NXP_MPU and not dt_chosen_enabled("zephyr,itcm")
     arch_allow: arm