ARM: dts: at91: nattis: state the actual lvds-encoder chip

Just to be explicit.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/boot/dts/at91-nattis-2-natte-2.dts

@@ -117,7 +117,7 @@
 	};
 
 	lvds-encoder {
-		compatible = "lvds-encoder";
+		compatible = "ti,ds90c185", "lvds-encoder";
 
 		ports {
 			#address-cells = <1>;