global: Make <asm/global_data.h> include <asm/u-boot.h>

This follows the example of RISC-V where <asm/global_data.h> includes
<asm/u-boot.h> directly as "gd" includes a reference to bd_info already
and so the first must include the second anyhow. We then remove
<asm/u-boot.h> from all of the places which include references to "gd"
an so have <asm/global_data.h> already.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/sandbox/include/asm/global_data.h b/arch/sandbox/include/asm/global_data.h
index 001b2b5..309422f 100644
--- a/arch/sandbox/include/asm/global_data.h
+++ b/arch/sandbox/include/asm/global_data.h
@@ -10,6 +10,7 @@
 #define __ASM_GBL_DATA_H
 
 #include <linux/types.h>
+#include <asm/u-boot.h>
 
 /* Architecture-specific global data */
 struct arch_global_data {