am 84fa4c5b: am 4fa3514d: am 42d55df9: Disable HW BACK key at the incoming-call screen

* commit '84fa4c5b56882e21f89feb71cd6d2ae0ae6682ad':
  Disable HW BACK key at the incoming-call screen
tree: 8d3c635219064fbcd7f153e81c1a81b757b96e65
  1. InCallUI/