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/a38x/hydra.c b/board/gdsys/a38x/hydra.c
index daade6d..495a976 100644
--- a/board/gdsys/a38x/hydra.c
+++ b/board/gdsys/a38x/hydra.c
@@ -1,6 +1,7 @@
 #include <common.h>
 #include <command.h>
 #include <console.h> /* ctrlc */
+#include <pci.h>
 #include <asm/io.h>
 
 #include "hydra.h"