am fba6c12a: Merge "graphics.h: add new Y8, Y16 formats" into jb-mr1-aah-dev

# Via Android (Google) Code Review (1) and Igor Murashkin (1)
* commit 'fba6c12a3e6ac5fabe91270293b1115f72fd48a1':
  graphics.h: add new Y8, Y16 formats