global: Make <asm/global_data.h> include <asm/u-boot.h>

This follows the example of RISC-V where <asm/global_data.h> includes
<asm/u-boot.h> directly as "gd" includes a reference to bd_info already
and so the first must include the second anyhow. We then remove
<asm/u-boot.h> from all of the places which include references to "gd"
an so have <asm/global_data.h> already.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/cpu/mpc85xx/p4080_ids.c b/arch/powerpc/cpu/mpc85xx/p4080_ids.c
index 25050412..15ab4ac 100644
--- a/arch/powerpc/cpu/mpc85xx/p4080_ids.c
+++ b/arch/powerpc/cpu/mpc85xx/p4080_ids.c
@@ -4,6 +4,7 @@
  */
 
 #include <config.h>
+#include <linux/kernel.h>
 #include <asm/fsl_portals.h>
 #include <asm/fsl_liodn.h>