[card] Refactor virtual profiles.
[card] Add availability to virtual profile and deny activating unavailable profile.
[source] Add support for voicecall source.

When device is provided when calling pa_droid_source_new() and device is
AUDIO_DEVICE_IN_VOICE_CALL, force mono channels and hal channel mask for
recording from both uplink and downlink.
[module-droid-source] Use updated droid-source.
[card] Add support for virtual profile extensions and voicecall record.

When in voicecall profile, one can switch to voicecall-record profile,
which destroys active sources and creates source specifically for
voicecall recording.
[build] Autogenerate DROID_DEVICE_FOO for droid device.
[util] Refactor HAL includes to per-droid-version headers.
[util] Define QCOM_HARDWARE for Hammerhead (Nexus 5).
[source] Use AUDIO_IN_VOICE_CALL_MONO only with QC hardware.
[util] Remove static from headers.
[util] Define QCOM_HARDWARE for Sbj (Jolla).
[util] Add hint when checking android version.
[util] Remove couple unused variables.
[source] Allow usage of module argument input_devices.
Merge pull request #14 from jusa/voicecall-record

Implement voicecall record support.