fix(rmm-eac5): fix MISRA C defects

Fixes MISRA C 2012 Rule 2.3, 12.1 and 18.4 violations.

Change-Id: I7b96776da05c636fde89d915b0aae5a7134baab4
Signed-off-by: AlexeiFedorov <Alexei.Fedorov@arm.com>
diff --git a/plat/common/src/plat_common_init.c b/plat/common/src/plat_common_init.c
index 2e51d7b..ecb3c19 100644
--- a/plat/common/src/plat_common_init.c
+++ b/plat/common/src/plat_common_init.c
@@ -37,17 +37,17 @@
 #define RMM_CODE		MAP_REGION_FLAT(			\
 					RMM_CODE_START,			\
 					RMM_CODE_SIZE,			\
-					MT_CODE | MT_REALM)
+					(MT_CODE | MT_REALM))
 
 #define RMM_RO			MAP_REGION_FLAT(			\
 					RMM_RO_START,			\
 					RMM_RO_SIZE,			\
-					MT_RO_DATA | MT_REALM)
+					(MT_RO_DATA | MT_REALM))
 
 #define RMM_RW			MAP_REGION_FLAT(			\
 					RMM_RW_START,			\
 					RMM_RW_SIZE,			\
-					MT_RW_DATA | MT_REALM)
+					(MT_RW_DATA | MT_REALM))
 
 /*
  * Leave an invalid page between the end of RMM memory and the beginning
@@ -64,7 +64,7 @@
 					0U,				\
 					RMM_SHARED_BUFFER_START,	\
 					0U,				\
-					MT_RW_DATA | MT_REALM)
+					(MT_RW_DATA | MT_REALM))
 
 /* Number of common memory mapping regions */
 #define COMMON_REGIONS		(4U)