am 4fa3514d: am 42d55df9: Disable HW BACK key at the incoming-call screen

* commit '4fa3514de09f7f91fd89956520b6aee16c512d12':
  Disable HW BACK key at the incoming-call screen
tree: 983fbe31b3cf7ffda47cd03ce4d9fce17d1c56ac
  1. InCallUI/