ppc4xx: Move gpio.h to ppc4xx-gpio.h since its ppc4xx specific

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/board/quad100hd/quad100hd.c b/board/quad100hd/quad100hd.c
index f878c49..2f72d2b 100644
--- a/board/quad100hd/quad100hd.c
+++ b/board/quad100hd/quad100hd.c
@@ -33,7 +33,7 @@
 
 #include <asm/processor.h>
 #include <asm/io.h>
-#include <asm/gpio.h>
+#include <asm/ppc4xx-gpio.h>
 
 DECLARE_GLOBAL_DATA_PTR;