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

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/board/amcc/canyonlands/canyonlands.c b/board/amcc/canyonlands/canyonlands.c
index ccc44f4..b26cadb 100644
--- a/board/amcc/canyonlands/canyonlands.c
+++ b/board/amcc/canyonlands/canyonlands.c
@@ -27,7 +27,7 @@
 #include <asm/io.h>
 #include <asm/mmu.h>
 #include <asm/4xx_pcie.h>
-#include <asm/gpio.h>
+#include <asm/ppc4xx-gpio.h>
 #include <asm/errno.h>
 
 extern flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */