fix(services): declare unused parameters as void

This corrects the MISRA violation C2012-2.7:
There should be no unused parameters in functions.
Declared unused function parameters as void.

Change-Id: I44aa576a081f0925aa29b42d7432faec46605a87
Signed-off-by: Nithin G <nithing@amd.com>
Signed-off-by: Maheedhar Bollapalli <maheedharsai.bollapalli@amd.com>
diff --git a/services/arm_arch_svc/arm_arch_svc_setup.c b/services/arm_arch_svc/arm_arch_svc_setup.c
index f76bbea..94506ed 100644
--- a/services/arm_arch_svc/arm_arch_svc_setup.c
+++ b/services/arm_arch_svc/arm_arch_svc_setup.c
@@ -267,6 +267,11 @@
 	void *handle,
 	u_register_t flags)
 {
+	(void)x2;
+	(void)x3;
+	(void)x4;
+	(void)cookie;
+
 	switch (smc_fid) {
 	case SMCCC_VERSION:
 		SMC_RET1(handle, smccc_version());