lcd: add corgibl_limit_intensity() to corgi_lcd

This is not generic enough, added here for backward compatibility.
And make this an individual commit so future revert will be a bit
easier.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

include/linux/spi/corgi_lcd.h

@@ -8,6 +8,7 @@ struct corgi_lcd_platform_data {
 	int	init_mode;
 	int	max_intensity;
 	int	default_intensity;
+	int	limit_mask;
 
 	void (*notify)(int intensity);
 	void (*kick_battery)(void);