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/test/dm/mux-emul.c b/test/dm/mux-emul.c
index 45154ce..58233ed 100644
--- a/test/dm/mux-emul.c
+++ b/test/dm/mux-emul.c
@@ -9,6 +9,7 @@
 #include <mux-internal.h>
 #include <dm/test.h>
 #include <test/ut.h>
+#include <asm/global_data.h>
 
 struct mux_emul_priv {
 	u32 state;