Refactor IonBuffer to use GraphicBuffer

- Replace gralloc0 based implementation with GraphicBuffer implementation.
- Removed incompatible ion-buffer unit-tests.
- Added libui dependencies to dependants.

Bug: 34879523
Test: Tested on Lucid, validated graphics and poses are working
Change-Id: I49a129f269d54c81bda93b44d879d4b8dee2006a