arm/mxs: move MXS_GPIO_NR into mach/mxs.h

The patch moves MXS_GPIO_NR into mach/mxs.h, so that we only use
standard gpiolib helpers in mach/gpio.h.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mxs/include/mach/gpio.h

@@ -22,8 +22,6 @@
 
 #include <asm-generic/gpio.h>
 
-#define MXS_GPIO_NR(bank, nr)	((bank) * 32 + (nr))
-
 /* use gpiolib dispatchers */
 #define gpio_get_value		__gpio_get_value
 #define gpio_set_value		__gpio_set_value