ARM: dts: imx6qdl-tx6: Remove 'bus-format-override' property

The 'bus-format-override' property is not documented nor used
anywhere else, so just remove it.
Reported-by: NRob Herring <robh@kernel.org>
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-tx6-lcd.dtsi

@@ -77,7 +77,6 @@
 		enable-gpios = <&gpio3 29 GPIO_ACTIVE_HIGH>;
 		power-supply = <&reg_3v3>;
 		backlight = <&backlight>;
-		bus-format-override = "rgb24";
 
 		port {
 			lcd_panel_in: endpoint {

arch/arm/boot/dts/imx6qdl-tx6-mb7.dtsi

@@ -54,19 +54,16 @@
 
 	lcd-panel {
 		compatible = "edt,et057090dhu";
-		bus-format-override = "rgb24";
 		pixelclk-active = <0>;
 	};
 
 	lvds0-panel {
 		compatible = "edt,etml1010g0dka";
-		bus-format-override = "spwg-18";
 		pixelclk-active = <0>;
 	};
 
 	lvds1-panel {
 		compatible = "edt,etml1010g0dka";
-		bus-format-override = "spwg-18";
 		pixelclk-active = <0>;
 	};
 };