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/egnite/ethernut5/ethernut5.c b/board/egnite/ethernut5/ethernut5.c
index 0674b30..559fdd2 100644
--- a/board/egnite/ethernut5/ethernut5.c
+++ b/board/egnite/ethernut5/ethernut5.c
@@ -60,6 +60,7 @@
 #include <i2c.h>
 #include <mmc.h>
 #include <atmel_mci.h>
+#include <asm/global_data.h>
 
 #include <asm/arch/at91sam9260.h>
 #include <asm/arch/at91sam9260_matrix.h>