[ARM] pxa: update pwm_backlight->notify() to include missed 'struct device *'

Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
diff --git a/arch/arm/mach-pxa/palmtc.c b/arch/arm/mach-pxa/palmtc.c
index 3084175..b992f07 100644
--- a/arch/arm/mach-pxa/palmtc.c
+++ b/arch/arm/mach-pxa/palmtc.c
@@ -185,7 +185,7 @@
 	return ret;
 }
 
-static int palmtc_backlight_notify(int brightness)
+static int palmtc_backlight_notify(struct device *dev, int brightness)
 {
 	/* backlight is on when GPIO16 AF0 is high */
 	gpio_set_value(GPIO_NR_PALMTC_BL_POWER, brightness);