[bluez] Update HFP feature advertisment. Fixes JB#14241.

bluetoothd did not update feature bitmask in service record
after telephony plugin had been initialized, which caused
interoperability problems with some headsets. Bitmask
update after telephony_ready_ind() gets called added.
Merge pull request #30 from hmallat/HFP-feature-advertisment

[bluez] Update HFP feature advertisment. Fixes JB#14241.