configs: msmcobalt: update BT-SCO sample rate strings to new format

There is no audio during bluetooth calls. This is due to a string mismatch
between an old and new format for specifying the BT-SCO sample rate. Update the
sample rate strings to the new format that is being transitioned to.

Change-Id: I259467fc47839179015781a0204cab7e0ae170bc
CRs-Fixed: 1045958