ppc4xx: Move ppc4xx headers to powerpc include directory

This patch moves some ppc4xx related headers from the common include
directory (include/) to the powerpc specific one
(arch/powerpc/include/asm/). This way to common include directory is not
so cluttered with files.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/net/4xx_enet.c b/drivers/net/4xx_enet.c
index d9487ad..bc9211e 100644
--- a/drivers/net/4xx_enet.c
+++ b/drivers/net/4xx_enet.c
@@ -87,9 +87,9 @@
 #include <asm/cache.h>
 #include <asm/mmu.h>
 #include <commproc.h>
-#include <ppc4xx.h>
-#include <ppc4xx_enet.h>
-#include <405_mal.h>
+#include <asm/ppc4xx.h>
+#include <asm/ppc4xx-emac.h>
+#include <asm/ppc4xx-mal.h>
 #include <miiphy.h>
 #include <malloc.h>