fix(zynqmp): modify conditions to have boolean type

This corrects the MISRA violation C2012-14.4:
The controlling expression of an if statement and the controlling
expression of an iteration-statement shall have essentially
boolean type.
Updated controlling expression to explicitly compare with zero.

Change-Id: I5bf7070db9bced50f5d37a3d9406301585930b50
Signed-off-by: Nithin G <nithing@amd.com>
Signed-off-by: Maheedhar Bollapalli <maheedharsai.bollapalli@amd.com>
diff --git a/plat/xilinx/zynqmp/plat_zynqmp.c b/plat/xilinx/zynqmp/plat_zynqmp.c
index e3a979e..65faa2f 100644
--- a/plat/xilinx/zynqmp/plat_zynqmp.c
+++ b/plat/xilinx/zynqmp/plat_zynqmp.c
@@ -10,7 +10,7 @@
 
 int32_t plat_core_pos_by_mpidr(u_register_t mpidr)
 {
-	if (mpidr & MPIDR_CLUSTER_MASK) {
+	if ((mpidr & MPIDR_CLUSTER_MASK) != 0U) {
 		return -1;
 	}