Add new carrier config to extend DisconnectCause to play busy tone

This carrier config is used to specify additional DisconnectCause for
playing busy tone.

Bug: 116189822
Test: manual - Checked that busy tone is played according to
"KEY_DISCONNECT_CAUSE_PLAY_BUSYTONE_INT_ARRAY".
Change-Id: I58afb08ddc718bfb23d6c8b4f248c4c05d084829
2 files changed