endeavoru/enrc2b: Revive HTC libril.so for in-call audio

The HTC libril.so listens on various sockets that are created by the HTC rild
service. libcall_volume.so uses these sockets to control the in-call audio and
other properties.

Change-Id: I9b2ab4afbc77114b29fcf3ede42e5de445259134