dt-bindings: msm/dp: Add bindings of MSM DisplayPort controller

Add bindings for Snapdragon DisplayPort controller driver.

Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>
Signed-off-by: Vara Reddy <varar@codeaurora.org>
Signed-off-by: Tanmay Shah <tanmay@codeaurora.org>
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1621856653-10649-4-git-send-email-mkrishn@codeaurora.org
Signed-off-by: Rob Clark <robdclark@chromium.org>