Effect AIDL VTS: skip state check after STOP if draining is not supported

some HAL implementations may need to do draining before transit to IDLE
Draining state introduced in kDrainSupportedVersion

Flag: EXEMPT bugfix
Bug: 386161796
Test: atest --test-mapping hardware/interfaces/audio/aidl/vts:presubmit
Change-Id: I74d3d674950cbdaf4ae5e6d839dd06f96b2e8142