arm64: versal: Remove gd reference

gd is not used in this file that's why doesn't make sense to declare it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/mach-versal/mp.c b/arch/arm/mach-versal/mp.c
index c97c311..9b0518d 100644
--- a/arch/arm/mach-versal/mp.c
+++ b/arch/arm/mach-versal/mp.c
@@ -5,13 +5,10 @@
  */
 
 #include <common.h>
-#include <asm/global_data.h>
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/sys_proto.h>
 
-DECLARE_GLOBAL_DATA_PTR;
-
 #define HALT		0
 #define RELEASE		1