Spatial Audio: Check if stereo spatialization property is enabled

Stereo spatialization will be enabled per device. Check the property
value along with the feature flag to enable spatialization for stereo
channel mask.

Bug: 323223919
Test: manual - Tested enable/disable behavior on raven and shiba
Test: manual - Playback stereo content with spatial audio enabled
Change-Id: I76255b0d5fb97d5b4d8195460910a32e5c4bcdc5