ARM: dts: imx: imx6sll: fix lcdif compatible

Fix lcdif compatible according to bindings doc.

dtbs_check tested only, a glance at the datasheet shows that it should be
the correct fallback compatible.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: akemnade

arch/arm/boot/dts/nxp/imx/imx6sll.dtsi

@@ -657,7 +657,7 @@
 			};
 
 			lcdif: lcd-controller@20f8000 {
-				compatible = "fsl,imx6sll-lcdif", "fsl,imx28-lcdif";
+				compatible = "fsl,imx6sll-lcdif", "fsl,imx6sx-lcdif";
 				reg = <0x020f8000 0x4000>;
 				interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clks IMX6SLL_CLK_LCDIF_PIX>,