MIPS: add asm/gpio.h to fix compilation error with CONFIG_CMD_GPIO.

With CONFIG_CMD_GPIO compilation reports error.
common/cmd_gpio.c:13:22: fatal error: asm/gpio.h: No such file or directory
 #include <asm/gpio.h>
                      ^
Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>
Reviewed-by: Chin Liang See <clsee@altera.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/arch/mips/include/asm/gpio.h b/arch/mips/include/asm/gpio.h
new file mode 100644 (file)
index 0000000..306ab4c
--- /dev/null
+++ b/arch/mips/include/asm/gpio.h
@@ -0,0 +1 @@
+#include <asm-generic/gpio.h>