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: I44cbde4625d2fa94f9f0d88a4c3d3e8ceece5e05
1 file changed