hfp_ag_bluez5: Try to support non-phone hardware

hfp_ag_bluez5: Try to support non-phone hardware

For devices which are not 'real' phone modems, the voicecall
initialization can happen outside of the pre-sim state.  In this case
the voicecall atom detection logic fails.  Try to detect the voicecall
atom separately, and register the profile if the SIM atom is already
present and in state 'READY'.

For all other cases, the previous logic still applies.