Add feature to extend DisconnectCause to play busy tone

Feature to play busy tone according to DisconnectCause array defined in
"KEY_DISCONNECT_CAUSE_PLAY_BUSYTONE_INT_ARRAY".

Bug: 116189822
Test: manual - Checked that busy tone is played according to
"KEY_DISCONNECT_CAUSE_PLAY_BUSYTONE_INT_ARRAY".
Change-Id: I7d0346b535dc9dc16c5c93c3793f96948069e9d3
1 file changed