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>

include/cpu.h

@@ -7,6 +7,8 @@
 #ifndef __CPU_H
 #define __CPU_H
 
+struct udevice;
+
 /**
  * struct cpu_plat - platform data for a CPU
  * @cpu_id:	   Platform-specific way of identifying the CPU.