m7: Re-add digital dock routes for LPA and tunnel

* Change got stomped when updating to 4.4
* For supporting music playback over USB.

Change-Id: Ie8de0fa137e0f824a4d42f854c06b546d5a029eb
Merge pull request #1 from CyanogenMod/cm-11.0

m7: Re-add digital dock routes for LPA and tunnel