tests: protection: Fix building on ARC

Added a case for ARC in the test so it builds.  ARC MPU has execute
permision bit so we can enable the NO_EXECUTE_SUPPORT testing.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
diff --git a/tests/kernel/mem_protect/protection/src/main.c b/tests/kernel/mem_protect/protection/src/main.c
index cf173c4..eacd71a 100644
--- a/tests/kernel/mem_protect/protection/src/main.c
+++ b/tests/kernel/mem_protect/protection/src/main.c
@@ -50,6 +50,8 @@
 
 #if defined(CONFIG_ARM)
 #define NO_EXECUTE_SUPPORT 1
+#elif defined(CONFIG_ARC)
+#define NO_EXECUTE_SUPPORT 1
 #elif defined(CONFIG_X86)
 #if defined(CONFIG_X86_PAE_MODE)
 #define NO_EXECUTE_SUPPORT 1