configs: Update HIDL version and Enable multi-stage SVA flag.

-Sound trigger HIDL interface supports loading of more
than 1MB sound models from 2.1 version. Update to use HIDL
version 2.1.
-Set the audio feature flag to enable multi-stage SVA.

Change-Id: If8c15d5b3e23724797a03ad5770cf9d263207c48
1 file changed