Spatializer: Fix usb headset

Fixes the general transaural and
binaural equivalence of different devices.
Prior to this fix only speaker and true 3.5mm wired headphones
could be enabled.

Now all SADevices will have a canonical device type.

Test: Plug in USB headset, verify spatializer works.
Bug: 239081163
Change-Id: I904a299556f1cccb9d8d69a23245e387f7a5d35e