Add OWNERS for VTS module VtsHalSoundtriggerV2_2TargetTest

Each VTS module is required to have OWNERS file. The ownership is based on
go/vts-owners. For more information about ownership policy, please visit
go/xts-owners-policy.

Test: Tree Hugger
Bug: 143903671
Change-Id: I33aa46004d90aecda44d5c09809eabde0455a185