common: Drop asm/global_data.h from common header

Move this out of the common header and include it only where needed.  In
a number of cases this requires adding "struct udevice;" to avoid adding
another large header or in other cases replacing / adding missing header
files that had been pulled in, very indirectly.   Finally, we have a few
cases where we did not need to include <asm/global_data.h> at all, so
remove that include.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-at91/arm920t/clock.c b/arch/arm/mach-at91/arm920t/clock.c
index 9a57dd4..c744027 100644
--- a/arch/arm/mach-at91/arm920t/clock.c
+++ b/arch/arm/mach-at91/arm920t/clock.c
@@ -8,6 +8,7 @@
  * Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
  */
 #include <common.h>
+#include <asm/global_data.h>
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/at91_pmc.h>
diff --git a/arch/arm/mach-at91/arm920t/timer.c b/arch/arm/mach-at91/arm920t/timer.c
index dca2d2c..c400e87 100644
--- a/arch/arm/mach-at91/arm920t/timer.c
+++ b/arch/arm/mach-at91/arm920t/timer.c
@@ -16,6 +16,7 @@
 #include <common.h>
 #include <init.h>
 #include <time.h>
+#include <asm/global_data.h>
 #include <linux/delay.h>
 
 #include <asm/io.h>