Add tetheroffload VTS to general-tests

Also add it to TEST_MAPPING so it's run in presubmits.

Test: na
Bug: 205762647
Change-Id: I9c43ffcff5ccf0fcabcab08101ebc454c7fe3317
(cherry picked from commit b9b0aa4878a1d34b879017852609fbab70db4236)
Merged-In: I9c43ffcff5ccf0fcabcab08101ebc454c7fe3317
2 files changed