Fix issue 3119463.

There is no call audio uplink when headphones w/o mic are connected.

This change together with a corresponding change in the kernel driver adds
a separate device for headphonjes without mic: output is routed to headphones
and input is routed from built-in mic.

Change-Id: I19955f76ece19f661ae25d6a42bbcbe235a9e652
2 files changed