ARM: dts: imx6qdl-apalis: Change to "adi,force-bt656-4"

According to adv7180.yaml, the correct property name is
"adi,force-bt656-4".

Update it accordingly to fix several dt-schema warnings:

adv7280@21: 'adv,force-bt656-4' does not match any of the regexes: ...

imx6qdl-apalis.dtsi is the only in-tree kernel user of this property.

BSD does have a adv7180 driver, so should not be impacted.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: Fabio Estevam

arch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi

@@ -691,7 +691,7 @@
 
 	adv_7280: adv7280@21 {
 		compatible = "adi,adv7280";
-		adv,force-bt656-4;
+		adi,force-bt656-4;
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_ipu1_csi0>;
 		reg = <0x21>;