xilinx: zynqmp: Move zynqmp_ipi.h to include directory

Move zynqmp_ipi.h to platform specific include directory.
Rename it to plat_ipi.h instead of platform name. So, it can
be used to common source files which needs platform specific
data.

Signed-off-by: Tejas Patel <tejas.patel@xilinx.com>
Reviewed-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>
diff --git a/plat/xilinx/zynqmp/sip_svc_setup.c b/plat/xilinx/zynqmp/sip_svc_setup.c
index 8d23a01..5b87679 100644
--- a/plat/xilinx/zynqmp/sip_svc_setup.c
+++ b/plat/xilinx/zynqmp/sip_svc_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -9,9 +9,9 @@
 #include <common/runtime_svc.h>
 #include <tools_share/uuid.h>
 
+#include <plat_ipi.h>
 #include "ipi_mailbox_svc.h"
 #include "pm_svc_main.h"
-#include "zynqmp_ipi.h"
 
 /* SMC function IDs for SiP Service queries */
 #define ZYNQMP_SIP_SVC_CALL_COUNT	0x8200ff00