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

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/board/t3corp/t3corp.c b/board/t3corp/t3corp.c
index 26568e2..04d6a2e 100644
--- a/board/t3corp/t3corp.c
+++ b/board/t3corp/t3corp.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>
 
 int board_early_init_f(void)
 {