fdt_support: delete unnecessary DECLARE_GLOBAL_DATA_PTR

gd->bd is not used in fdt_support.c.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/common/fdt_support.c b/common/fdt_support.c
index c690768..3c4edc4 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -17,11 +17,6 @@
 #include <exports.h>
 
 /*
- * Global data (for the gd->bd)
- */
-DECLARE_GLOBAL_DATA_PTR;
-
-/*
  * Get cells len in bytes
  *     if #NNNN-cells property is 2 then len is 8
  *     otherwise len is 4