common: Move embedded fdt location to fdtdec.h

These declarations are only used in fdtdec.c so move them to its header
file.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/common.h b/include/common.h
index 83c5d76..84fd275 100644
--- a/include/common.h
+++ b/include/common.h
@@ -63,9 +63,6 @@
 
 #include <display_options.h>
 
-extern u8 __dtb_dt_begin[];	/* embedded device tree blob */
-extern u8 __dtb_dt_spl_begin[];	/* embedded device tree blob for SPL/TPL */
-
 /**
  * arch_fixup_fdt() - Write arch-specific information to fdt
  *
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 696e0fd..c8a143d 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -111,6 +111,9 @@
 	u32	phys_lo;
 };
 
+extern u8 __dtb_dt_begin[];	/* embedded device tree blob */
+extern u8 __dtb_dt_spl_begin[];	/* embedded device tree blob for SPL/TPL */
+
 /**
  * Compute the size of a resource.
  *