feat(mpam): add MPAM system registers access test

Added a test which reads MPAM system registers to ensure that
EL3 is giving permission to Non-secure EL2 to access these registers.

Change-Id: Ie701a19c9682df6d6aeaec086954e275afff1843
Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
diff --git a/include/common/test_helpers.h b/include/common/test_helpers.h
index 6b44d0a..8cddc72 100644
--- a/include/common/test_helpers.h
+++ b/include/common/test_helpers.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2023, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2024, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -224,6 +224,14 @@
 		}								\
 	} while (false)
 
+#define SKIP_TEST_IF_MPAM_NOT_SUPPORTED()                                     \
+	do {                                                                    \
+		if(!is_feat_mpam_supported()){                                  \
+			tftf_testcase_printf("ARMv8.4-mpam not supported\n");   \
+			return TEST_RESULT_SKIPPED;                             \
+		}                                                               \
+	} while (false)
+
 #ifdef __aarch64__
 #define SKIP_TEST_IF_PA_SIZE_LESS_THAN(n)					\
 	do {									\