Remove unnecessary clients and rename files.

- Remove clients for obsolete services.
- Rename display protocol defs file to match purpose.
- Rename display manager client file. "impl" does not match naming
  conventions used by DVR libraries.
- Remove video mesh surface interface. This will be replaced by more
  general surface support in the unified O compositor.

Bug: 36401174
Test: Build; run cube sea.
Change-Id: Idb782623319329f6fa1b0aa45005d9fee3b9957d