ANDROID: drm/bridge: Introduce LT9611 DSI to HDMI bridge

Add LT9611 DSI to HDMI bridge driver, as well as the
i2s initialization logic.

Bug: 146449535
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
[jstultz: Minor build fixups for newer kernels, squashed in
 the i2s initialization logic, also squished in and reworked
 logic to avoid putting hardware to sleep and breaking hotplug
 originally by Amit]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: Ib0bbbf1d86582d9c2ccf1a3c678f1563a26ec04f