fix(xilinx): fix OVERRUN coverity violation

This change fixes below MISRA violation:
CID 441243:  Memory - corruptions  (OVERRUN)
Overrunning callee's array of size 7 by passing argument "7UL" in call to
"pm_ipi_send_sync".

Change-Id: Ie7fd9ccad058e97eb4b36c4f0e77be8bfb3e6006
Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>

plat/xilinx/common/include/pm_common.h

@@ -18,7 +18,6 @@
 
 #if IPI_CRC_CHECK
 #define PAYLOAD_ARG_CNT         8U
-#define RET_PAYLOAD_ARG_CNT	7U
 #define IPI_W0_TO_W6_SIZE       28U
 #define PAYLOAD_CRC_POS         7U
 #define CRC_INIT_VALUE          0x4F4EU
@@ -26,8 +25,8 @@
 #define CRC_POLYNOM             0x8005U
 #else
 #define PAYLOAD_ARG_CNT		7U
-#define RET_PAYLOAD_ARG_CNT	6U
 #endif
+#define RET_PAYLOAD_ARG_CNT	6U
 #define PAYLOAD_ARG_SIZE	4U	/* size in bytes */
 
 #define TZ_VERSION_MAJOR	1

plat/xilinx/common/pm_service/pm_svc_main.c

@@ -503,8 +503,8 @@ static uintptr_t eemi_api_handler(uint32_t api_id, const uint32_t *pm_arg,
 				  void *handle, uint32_t security_flag)
 {
 	enum pm_ret_status ret;
-	uint32_t buf[PAYLOAD_ARG_CNT] = {0};
-	uint32_t payload[PAYLOAD_ARG_CNT] = {0};
+	uint32_t buf[RET_PAYLOAD_ARG_CNT] = {0U};
+	uint32_t payload[PAYLOAD_ARG_CNT] = {0U};
 	uint32_t module_id;
 
 	module_id = (api_id & MODULE_ID_MASK) >> 8U;
@@ -514,7 +514,7 @@ static uintptr_t eemi_api_handler(uint32_t api_id, const uint32_t *pm_arg,
 			 pm_arg[4], pm_arg[5]);
 
 	ret = pm_ipi_send_sync(primary_proc, payload, (uint32_t *)buf,
-			       PAYLOAD_ARG_CNT);
+			       RET_PAYLOAD_ARG_CNT);
 
 	SMC_RET4(handle, (uint64_t)ret | ((uint64_t)buf[0] << 32U),
 		 (uint64_t)buf[1] | ((uint64_t)buf[2] << 32U),