fix(plat/xilinx/versal): resolve misra R17.7

MISRA Violation: MISRA-C:2012 R.17.7
- The value returned by a function having non-void return type shall be
  used ((void) missing for discarded return value.).

Signed-off-by: Abhyuday Godhasara <abhyuday.godhasara@xilinx.com>
Change-Id: I1e6a598b9fe6c571a3e5010ee832ef860dfe491d
diff --git a/plat/xilinx/versal/sip_svc_setup.c b/plat/xilinx/versal/sip_svc_setup.c
index 479a34c..6f2ff94 100644
--- a/plat/xilinx/versal/sip_svc_setup.c
+++ b/plat/xilinx/versal/sip_svc_setup.c
@@ -42,7 +42,7 @@
 static int32_t sip_svc_setup(void)
 {
 	/* PM implementation as SiP Service */
-	pm_setup();
+	(void)pm_setup();
 
 	return 0;
 }