fix(zynqmp): resolve misra R16.3 warnings

MISRA Violation: MISRA-C:2012 R.16.3
- An unconditional break statement shall terminate every switch-clause.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Change-Id: I96a8b627c593ff1293b725d443531e42368923c5
diff --git a/plat/xilinx/zynqmp/pm_service/pm_api_sys.c b/plat/xilinx/zynqmp/pm_service/pm_api_sys.c
index 5c4fd40..e524ba5 100644
--- a/plat/xilinx/zynqmp/pm_service/pm_api_sys.c
+++ b/plat/xilinx/zynqmp/pm_service/pm_api_sys.c
@@ -1544,6 +1544,7 @@
 	default:
 		data[0] = PM_RET_ERROR_ARGS;
 		WARN("Unimplemented query service call: 0x%x\n", qid);
+		break;
 	}
 }
 
@@ -1776,6 +1777,7 @@
 	default:
 		ret = PM_RET_ERROR_ARGS;
 		WARN("Unimplemented register_access call\n\r");
+		break;
 	}
 	return ret;
 }