hal:Add the check of bt_sco_on before SCO configuration

If trying to start sco configuration when bt_sco is off
a2dp.swb_configured will be set true, which will cause
a2dp path can't start output stream normally.

Add the check of adev->bt_sco_on before trying to start
SCO configuration when enabling bt-sco device.

CRs-Fixed: 2615901
Change-Id: Iedfa6a0477880893960ff6badac99dc309d95715
1 file changed