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/mpc85xx/t2080_serdes.c b/arch/powerpc/cpu/mpc85xx/t2080_serdes.c
index 5f34aab..16fa16b 100644
--- a/arch/powerpc/cpu/mpc85xx/t2080_serdes.c
+++ b/arch/powerpc/cpu/mpc85xx/t2080_serdes.c
@@ -5,7 +5,7 @@
  * Shengzhou Liu <Shengzhou.Liu@freescale.com>
  */
 
-#include <common.h>
+#include <asm/u-boot.h>
 #include <asm/fsl_serdes.h>
 #include <asm/processor.h>
 #include "fsl_corenet2_serdes.h"