DaVinci: rename gpio_defs.h to gpio.h

In preparation for a generic GPIO driver for the DA8xx processors,
rename <asm/arch/gpio_defs.h> to <asm/arch/gpio.h> and fix up all files
which include it.

Signed-off-by: Laurence Withers <lwithers@guralp.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
diff --git a/board/davinci/dm365evm/dm365evm.c b/board/davinci/dm365evm/dm365evm.c
index 5fb7611..ac54106 100644
--- a/board/davinci/dm365evm/dm365evm.c
+++ b/board/davinci/dm365evm/dm365evm.c
@@ -22,7 +22,7 @@
 #include <asm/arch/hardware.h>
 #include <asm/arch/emif_defs.h>
 #include <asm/arch/nand_defs.h>
-#include <asm/arch/gpio_defs.h>
+#include <asm/arch/gpio.h>
 #include <netdev.h>
 #include <asm/arch/davinci_misc.h>
 #ifdef CONFIG_DAVINCI_MMC