libexternal: Add support for changing resolution on HDMI

- set the property hdmi.resolution with the required mode
  (16,4,3,32,34,1)
- If that resolution is not supported by the TV, it will fall
  back to the best mode supported by the TV

Change-Id: I90ceda02319e79e388035ba7b5926bdcf6625595
CRs-fixed: 430055
2 files changed