hal: update bt-sco sample rate before device enable

- Some BT solutions set sample rate only at the time of BT connection
  but not for every device switch. Due to this sample rate is not
  set properly after device switch.
- Update bt-sco sample rate before device enable instead of sample rate
  set parameters call.

Change-Id: I07cb0c186296b00a99713b67628fb87b2f134d32