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>

post/drivers/memory.c

@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <log.h>
+#include <asm/global_data.h>
 
 /* Memory test
  *

post/post.c

@@ -14,6 +14,7 @@
 #include <watchdog.h>
 #include <div64.h>
 #include <post.h>
+#include <asm/global_data.h>
 
 #ifdef CONFIG_SYS_POST_HOTKEYS_GPIO
 #include <asm/gpio.h>