plat: versal: Update API list in feature check

Add below API in feature check list which is actually present in
firmware:
- PM_GET_CHIPID
Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Signed-off-by: Ravi Patel <ravi.patel@xilinx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Change-Id: I98b82da74164f065c8835861f74b0f2855e9bcbf

plat/xilinx/versal/pm_service/pm_api_sys.c

 /*
- * Copyright (c) 2019, Xilinx, Inc. All rights reserved.
+ * Copyright (c) 2019-2020, Xilinx, Inc. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -798,6 +798,7 @@ enum pm_ret_status pm_feature_check(uint32_t api_id, unsigned int *version)
 	case PM_SET_REQUIREMENT:
 	case PM_RESET_ASSERT:
 	case PM_RESET_GET_STATUS:
+	case PM_GET_CHIPID:
 	case PM_PINCTRL_REQUEST:
 	case PM_PINCTRL_RELEASE:
 	case PM_PINCTRL_GET_FUNCTION: