Support path interpolator in AVDC

Cherry picked from master & oc-dev
b77813a5dbce67e7ecb457e39900b82f04def8be

Test: Existing AVDC tests and newly added ones
Tested on API 15, 23, 25

Change-Id: Ie115464744d714e80c69215423c8a52436c89c21
43 files changed