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-mediatek/mt8518/init.c b/arch/arm/mach-mediatek/mt8518/init.c
index 531a403..28b00c3 100644
--- a/arch/arm/mach-mediatek/mt8518/init.c
+++ b/arch/arm/mach-mediatek/mt8518/init.c
@@ -16,6 +16,7 @@
 #include <asm/arch/misc.h>
 #include <asm/armv8/mmu.h>
 #include <asm/cache.h>
+#include <asm/global_data.h>
 #include <asm/sections.h>
 #include <dm/uclass.h>
 #include <dt-bindings/clock/mt8518-clk.h>