sdm: Add support for HDMI 2.0

- Read timing information from dynamically populated resolution
  file. This is required since support for HDMI 2.0 features will
  vary across HDMI TVs.

- Program the HDMI interface to set the output format to YUV420 if
  the selected mode supports YUV.

Change-Id: I3ca16285ff6b826b52b6dde12740c98bb2f1b550
2 files changed