display: Add support for overscan compensation for ext display

- Read scan_info sys file node to check if TV underscans
- Apply action safe parameters to avoid overscan on ext display
- Store action safe width and height ratio using system  property
- Use these to calculate the destination position on the ext display
- Remove unsed ActionSafe Class

Change-Id: Id27e6fa20966fb13fc16aa7e237cacce8caeb642
CRs-fixed: 447367
8 files changed