Add BufferHubServer_test to APTC

The integration tests for BufferHubBuffer client and bufferhub server
are in VtsFwkBufferHubV1_0TargetTest, and will be configured in VTS
dashboard.

Bug: 117177773
Bug: 112940221
Test: None
Change-Id: Ib3db59d688d6d8471d045bce2ef914442c06c886