dt-bindings: display: bridge: simple: document the Algoltek AG6311 DP-to-HDMI bridge

The Algoltek AG6311 is a transparent DisplayPort to HDMI bridge.

Reviewed-by: Dmitry Baryshkov <[e-mail]>
Acked-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Val Packett <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Dmitry Baryshkov <[e-mail]>

Documentation/devicetree/bindings/display/bridge/simple-bridge.yaml

···
           - const: adi,adv7123
       - enum:
           - adi,adv7123
+          - algoltek,ag6311
           - asl-tek,cs5263
           - dumb-vga-dac
           - parade,ps185hdm