dt-bindings: display: bridge: lvds-transmitter: add ti, ds90c185

Start list of actual chips compatible with "lvds-encoder".

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180825085620.10566-2-peda@axentia.se

Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt

@@ -22,7 +22,13 @@ among others.
 
 Required properties:
 
-- compatible: Must be "lvds-encoder"
+- compatible: Must be one or more of the following
+  - "ti,ds90c185" for the TI DS90C185 FPD-Link Serializer
+  - "lvds-encoder" for a generic LVDS encoder device
+
+  When compatible with the generic version, nodes must list the
+  device-specific version corresponding to the device first
+  followed by the generic version.
 
 Required nodes: