ANDROID: lt9611: Sync w/ Vinod's most recent lt9611 patches which enable HDMI audio

Vinod has reworked the lt9611 hdmi bridge support in preperation
to upstream it, allong with adding HDMI audio support.

This patch algins the android-mainline tree to match his v3 patches
that he has submitted upstream (see link).

Bug: 146449535
Fixes: 3599a06b ("ANDROID: drm/bridge: Introduce LT9611 DSI to HDMI bridge")
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: Iaed396f409a5a12effcb6a9d63834483e20a1d47
Link: https://lore.kernel.org/lkml/20200617105950.3165360-1-vkoul@kernel.org/