arm: dts: imx7ulp-evk: remove mux value from pad configuration

The mux mode is embedded in the PAD definition and therefore there is
no need to repeat it in the PAD configuration value (more over since
this information will be masked out when the configuration value is
applied).

Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/arch/arm/dts/imx7ulp-evk.dts b/arch/arm/dts/imx7ulp-evk.dts
index 08a682f..8f6a935 100644
--- a/arch/arm/dts/imx7ulp-evk.dts
+++ b/arch/arm/dts/imx7ulp-evk.dts
@@ -156,7 +156,7 @@
 
 		pinctrl_backlight: backlight_grp {
 			fsl,pins = <
-				IMX7ULP_PAD_PTF2__PTF2		0x20100
+				IMX7ULP_PAD_PTF2__PTF2		0x20000
 			>;
 		};