am f6fb19c1: Merge "Add support for hardware CALL button." into klp-dev

* commit 'f6fb19c1e4ac91a325f0f2608f874ce18b33a7f9':
  Add support for hardware CALL button.
tree: 3c7f2e2b2422e8caffb7e985e5747c3bc854ff13
  1. InCallUI/