[vim-display] Switch OSD to use hwreg library Test: framebuffer on VIM2 Change-Id: I3c853ccc9282b7f7337d55d16cea5c696f114a19
[vim-display][display-test] Support NV12 layers The single fullscreen layer can now use an NV12 image. Test: display-test Change-Id: Ie85f91bb4b1ecd5e476012af14fc9d872cccfc46