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/board/gdsys/mpc8308/gazerbeam.c b/board/gdsys/mpc8308/gazerbeam.c
index 0e7fa1e..4e974c5 100644
--- a/board/gdsys/mpc8308/gazerbeam.c
+++ b/board/gdsys/mpc8308/gazerbeam.c
@@ -17,6 +17,7 @@
 #include <sysinfo.h>
 #include <tpm-v1.h>
 #include <video_osd.h>
+#include <asm/global_data.h>
 
 #include "../common/ihs_mdio.h"
 #include "../../../drivers/sysinfo/gazerbeam.h"
diff --git a/board/gdsys/mpc8308/sdram.c b/board/gdsys/mpc8308/sdram.c
index 9695fb0..bfd55f5 100644
--- a/board/gdsys/mpc8308/sdram.c
+++ b/board/gdsys/mpc8308/sdram.c
@@ -19,6 +19,7 @@
 #include <spd_sdram.h>
 
 #include <asm/bitops.h>
+#include <asm/global_data.h>
 #include <asm/io.h>
 
 #include <asm/processor.h>