HDMI: Reset overscan when resolution is changed in picker

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>
Settings: Break up HdmiSettings into Display and Sound

Display now contains:
------
* Overscan compensation is now Display Position
* HDMI output mode is now Display Resolution
* Auto adjust

Sound now contains:
------
* Digital Audio output

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>
Display: Resolution: Load available resolutions onCreate

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>