dt-bindings: drm/bridge: anx7625: MIPI to DP transmitter DT schema

anx7625: MIPI to DP transmitter DT schema

Signed-off-by: Xin Ji <xji@analogixsemi.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/bafa02aa50c5c29b3336ca6930c406150a3c60d2.1600423932.git.xji@analogixsemi.com