Add OWNERS for VTS module VtsHalNeuralnetworksV1_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: Id49d1630f193617521d089e0b0b2f5ce180467b6