Proper handling of BTRH command in HFP client

Usecase:
1. Enable hf client role and connect to AG.
2. Run PTS test case RHH/BV-04.

Failure:
PTS test case fails since the test expects the call to be active.

Rootcause:
Hf client is not sending AT+BTRH for accepting held call

Fix:
Remove unnecessary check against of action policy flag while
executing BTRH command

Change-Id: Iebd5e02f3bf70cc39288219340cd47ebad3d8349