backlight: lp855x: fix initial brightness type

Valid range of the brightness is from 0 to 255, so initial brightness
is changed from integer to u8.
Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/linux/platform_data/lp855x.h

@@ -124,7 +124,7 @@ struct lp855x_rom_data {
 struct lp855x_platform_data {
 	const char *name;
 	u8 device_control;
-	int initial_brightness;
+	u8 initial_brightness;
 	unsigned int period_ns;
 	u8 load_new_rom_data;
 	int size_program;