tests: mem_protect: enable for Xtensa

This enables tests/kernel/mem_protect/mem_protect to be tested
on Xtensa.

Signed-off-by: Daniel Leung <[email protected]>
Signed-off-by: Flavio Ceolin <[email protected]>

Author: dcpleung

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

@@ -67,6 +67,8 @@ static inline void set_fault_valid(bool valid)
 #else
 #define MEM_REGION_ALLOC (4)
 #endif
+#elif defined(CONFIG_XTENSA)
+#define MEM_REGION_ALLOC (4096)
 #else
 #error "Test suite not compatible for the given architecture"
 #endif