ARM: dts: imx6sl-tolino-shine2hd: Add backlight boost

Vendor system has a separate checkbox for increasing brightness of the
backlight combined with a big warning that power consumption will
greatly increase. With that checkbox enabled there is a greater range in
which backlight brightness can be adjusted
Add a switch to achieve the same, since the backlight is actually LED,
this seems to be the most appopiate place to add it. Nothing fits
perfectly.

Signed-off-by: Andreas Kemnade <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/imx6sl-tolino-shine2hd.dts

···
 			gpios = <&gpio5 13 GPIO_ACTIVE_LOW>;
 			linux,default-trigger = "timer";
 		};
+
+		led-1 {
+			label = "tolinoshine2hd:white:backlightboost";
+			gpios = <&gpio1 29 GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "off";
+		};
 	};
 
 	memory@80000000 {
···
 
 	pinctrl_led: ledgrp {
 		fsl,pins = <
-			MX6SL_PAD_SD1_DAT2__GPIO5_IO13 0x17059
+			MX6SL_PAD_SD1_DAT2__GPIO5_IO13    0x17059
+			MX6SL_PAD_EPDC_SDCE2__GPIO1_IO29  0x17059
 		>;
 	};