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/mpc83xx/pcie.c b/arch/powerpc/cpu/mpc83xx/pcie.c
index 47ca74c5..feecf8a 100644
--- a/arch/powerpc/cpu/mpc83xx/pcie.c
+++ b/arch/powerpc/cpu/mpc83xx/pcie.c
@@ -7,7 +7,7 @@
  *          Anton Vorontsov <avorontsov@ru.mvista.com>
  */
 
-#include <common.h>
+#include <asm/u-boot.h>
 #include <clock_legacy.h>
 #include <pci.h>
 #include <mpc83xx.h>