Change unit test suites to device tests.

Since VHAL is not supposed to run on all devices, only auto targets,
we change the test suites to device-tests. This also prevents the
unit tests to be run against an incompatible version of vendor
image, which causes test breakage.

Bug: 201009483
Test: presubmits
Change-Id: I8878ce6f8200dbc4a3247258f835e980fbaa2028