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>

board/google/imx8mq_phanbell/imx8mq_phanbell.c

@@ -8,6 +8,7 @@
 #include <init.h>
 #include <malloc.h>
 #include <errno.h>
+#include <asm/global_data.h>
 #include <asm/io.h>
 #include <miiphy.h>
 #include <netdev.h>

board/google/imx8mq_phanbell/spl.c

@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <hang.h>
+#include <asm/global_data.h>
 #include <asm/io.h>
 #include <errno.h>
 #include <init.h>

board/google/veyron/veyron.c

@@ -9,6 +9,7 @@
 #include <init.h>
 #include <log.h>
 #include <asm/arch-rockchip/clock.h>
+#include <asm/global_data.h>
 #include <dt-bindings/clock/rk3288-cru.h>
 #include <linux/delay.h>
 #include <linux/err.h>