Fix incorrect sysprop name

Starting from Q-launching devices, sysprops defined by vendor should
start with vendor. or ro.vendor. Therefore, renaming
ro.qc.sdk.audio.fluencetype to ro.vendor.audio.sdk.fluencetype. For
legacy compatibility, the HAL reads both sysprops; first the new one and
then falls back to the old one.

Bug: 139108926
Test: making a video call via Duo, make sure sound works
Test: vol adjust during a phone call works
Change-Id: I54babf96de702a142cbe860f59d6b5b011bfa374