[bluez] Start AVDTP after delay even if not INT. Contributes to JB#10965.

bluetoothd would not issue a AVDTP stream start if it was not the
initiator; however Sony SBH50 headset would also not issue AVDTP
stream start even if it is and had configured the stream, so no
audio would flow.

Applied upstream commit e2d49cfa8 with some small additions.