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/arch/powerpc/cpu/ppc4xx/denali_data_eye.c b/arch/powerpc/cpu/ppc4xx/denali_data_eye.c
index 03b8d3c..9bba0ca 100644
--- a/arch/powerpc/cpu/ppc4xx/denali_data_eye.c
+++ b/arch/powerpc/cpu/ppc4xx/denali_data_eye.c
@@ -36,7 +36,7 @@
 #include <common.h>
 #include <asm/processor.h>
 #include <asm/io.h>
-#include <ppc4xx.h>
+#include <asm/ppc4xx.h>
 
 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
 /*-----------------------------------------------------------------------------+