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/alliedtelesis/SBx81LIFKW/sbx81lifkw.c

@@ -7,6 +7,7 @@
 #include <common.h>
 #include <init.h>
 #include <net.h>
+#include <asm/global_data.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/io.h>

board/alliedtelesis/SBx81LIFXCAT/sbx81lifxcat.c

@@ -10,6 +10,7 @@
 #include <net.h>
 #include <netdev.h>
 #include <led.h>
+#include <asm/global_data.h>
 #include <linux/bitops.h>
 #include <linux/io.h>
 #include <asm/arch/cpu.h>

board/alliedtelesis/common/gpio_hog.c

@@ -5,6 +5,7 @@
 
 #include <common.h>
 #include <dm.h>
+#include <asm/global_data.h>
 #include <asm/gpio.h>
 
 DECLARE_GLOBAL_DATA_PTR;

board/alliedtelesis/x530/x530.c

@@ -10,6 +10,7 @@
 #include <i2c.h>
 #include <init.h>
 #include <wdt.h>
+#include <asm/global_data.h>
 #include <asm/gpio.h>
 #include <linux/bitops.h>
 #include <linux/mbus.h>