[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/palmz72.c b/arch/arm/mach-pxa/palmz72.c
index d787ac7..1c5d68a 100644
--- a/arch/arm/mach-pxa/palmz72.c
+++ b/arch/arm/mach-pxa/palmz72.c
@@ -196,7 +196,7 @@
 	return ret;
 }
 
-static int palmz72_backlight_notify(int brightness)
+static int palmz72_backlight_notify(struct device *dev, int brightness)
 {
 	gpio_set_value(GPIO_NR_PALMZ72_BL_POWER, brightness);
 	gpio_set_value(GPIO_NR_PALMZ72_LCD_POWER, brightness);