Enable unit tests in postsubmit

After some time of running these in postsubmit, these will be changed
to presubmit.

- Added SonivoxTest to device-tests test suite
- Also run bpfmt on test/Android.bp.

Bug: 304383609
Test: atest SonivoxTest
Change-Id: I44877607193e14531f1d87928fb7487ccaec3fdd
2 files changed