fix(psci): modify variable conflicting with external function

This corrects the MISRA violation C2012-5.8:
Identifiers that define objects or functions with
external linkage shall be unique.
Modify the variable name to prevent conflict with
external function declaration

Change-Id: I2f109242b6dd3b3c5e9289881e3dd5466c74fcb5
Signed-off-by: Nithin G <nithing@amd.com>
Signed-off-by: Maheedhar Bollapalli <maheedharsai.bollapalli@amd.com>
diff --git a/lib/psci/psci_on.c b/lib/psci/psci_on.c
index 7e161dd..3eacb9c 100644
--- a/lib/psci/psci_on.c
+++ b/lib/psci/psci_on.c
@@ -93,7 +93,7 @@
 				psci_svc_cpu_data.aff_info_state);
 	rc = cpu_on_validate_state(psci_get_aff_info_state_by_idx(target_idx));
 	if (rc != PSCI_E_SUCCESS)
-		goto exit;
+		goto on_exit;
 
 	/*
 	 * Call the cpu on handler registered by the Secure Payload Dispatcher
@@ -151,7 +151,7 @@
 					psci_svc_cpu_data.aff_info_state);
 	}
 
-exit:
+on_exit:
 	psci_spin_unlock_cpu(target_idx);
 	return rc;
 }