powerpc: Remove <common.h> and add needed includes

Remove <common.h> from all powerpc architecture files and when needed add
missing include files directly. This typically involves using
<asm/u-boot.h> instead due to the difficult nested structure of the
PowerPC includes themselves.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/cpu/mpc8xxx/pamu_table.c b/arch/powerpc/cpu/mpc8xxx/pamu_table.c
index b906279..e55173a 100644
--- a/arch/powerpc/cpu/mpc8xxx/pamu_table.c
+++ b/arch/powerpc/cpu/mpc8xxx/pamu_table.c
@@ -3,7 +3,7 @@
  * Copyright 2012-2016 Freescale Semiconductor, Inc.
  */
 
-#include <common.h>
+#include <asm/u-boot.h>
 #include <log.h>
 #include <asm/fsl_pamu.h>
 #include <asm/global_data.h>