tests: userspace: Fix test for AArch64

Fix tests/kernel/mem_protect/mem_protect/ adding support for AArch64.

Signed-off-by: Carlo Caione <[email protected]>

Author: carlocaione

tests/kernel/mem_protect/mem_protect/src/mem_protect.h

@@ -101,6 +101,8 @@ static inline void set_fault_valid(bool valid)
 #define MEM_REGION_ALLOC (4096)
 #elif defined(CONFIG_ARC)
 #define MEM_REGION_ALLOC (Z_ARC_MPU_ALIGN)
+#elif defined(CONFIG_ARM64)
+#define MEM_REGION_ALLOC (4096)
 #elif defined(CONFIG_ARM)
 #define MEM_REGION_ALLOC (Z_THREAD_MIN_STACK_ALIGN)
 #elif defined(CONFIG_RISCV)