sample: arch: mpu: mpu_test: skip run automate for SoC S32Z

Due to input automated testing, the memory addresses (0x1, 0x2)
are not available in any managed memory region, causing the
automated test to fail. This test should be run manually.

Signed-off-by: Cong Nguyen Huu <cong.nguyenhuu@nxp.com>