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/zynqmp_ipi.c b/plat/xilinx/zynqmp/zynqmp_ipi.c
index 2830ea3..96f2b9c 100644
--- a/plat/xilinx/zynqmp/zynqmp_ipi.c
+++ b/plat/xilinx/zynqmp/zynqmp_ipi.c
@@ -15,10 +15,9 @@
 #include <common/runtime_svc.h>
 #include <lib/bakery_lock.h>
 #include <lib/mmio.h>
+#include <plat_ipi.h>
 #include <plat_private.h>
 
-#include "zynqmp_ipi.h"
-
 /*********************************************************************
  * Macros definitions
  ********************************************************************/