plat: xilinx: zynqmp: Move zynqmp_def.h to include directory

Move zynqmp_def.h to platform specific include directory.
Also, update source file to include header file from updated
path of zynqmp_def.h

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/include/platform_def.h b/plat/xilinx/zynqmp/include/platform_def.h
index e3c9fcc..fb10411 100644
--- a/plat/xilinx/zynqmp/include/platform_def.h
+++ b/plat/xilinx/zynqmp/include/platform_def.h
@@ -12,7 +12,7 @@
 #include <drivers/arm/gic_common.h>
 #include <lib/utils_def.h>
 
-#include "../zynqmp_def.h"
+#include "zynqmp_def.h"
 
 /*******************************************************************************
  * Generic platform constants