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/pm_service/pm_ipi.c b/plat/xilinx/zynqmp/pm_service/pm_ipi.c
index 66393ef..88e23f0 100644
--- a/plat/xilinx/zynqmp/pm_service/pm_ipi.c
+++ b/plat/xilinx/zynqmp/pm_service/pm_ipi.c
@@ -7,10 +7,10 @@
 #include <arch_helpers.h>
 #include <lib/bakery_lock.h>
 #include <lib/mmio.h>
+#include <plat_ipi.h>
 #include <plat_private.h>
 #include <plat/common/platform.h>
 
-#include "../zynqmp_ipi.h"
 #include "pm_ipi.h"
 
 /* IPI message buffers */