Update OWNERS for VtsHalCas* tests.

Added a bug component where issues seen on this test are triaged. This
will affect the following tests:

VtsHalCasV1_0TargetTest
VtsHalCasV1_1TargetTest
VtsHalCasV1_2TargetTest

Test: Tree Hugger
Bug: 143903671
Change-Id: I03c7b69a7db49d6793ea023691312be8bcfc7195
3 files changed