Revert "[voicecall] Remove pulseaudio and resource policy plugins."

This reverts commit e88d2d822019013fbe4b97064a8ab4c3f0091b30.

With these plugins available, I'm able to use the ofono manager to make calls, with audio, without using Telepathy.

To do so, install the ofono, pulseaudio, and resource-policy-routing plugins; remove the voicecall telepathy plugin; disable telepathy-ring with:

mc-tool disable ring/tel/account0

Restart relevant processes and calls should be functional.