Fixing reject on CDMA devices.

Phone.rejectCall() does not universally work between GSM and CDMA
devices. The right way, ironically, is to invoke hangup() on the Call
object.

Also, adjusted the disconnect cause for calls that were either aborted
or disconnected locally to use DisconnectCause.LOCAL.

Bug: 15197550
Change-Id: Iac113f53a19439a4bc4d1017b23068d1d6b27cb4
2 files changed