b/145383354 is obsolete and this works as is (or we'd have found
out by now). Also min SDK version is set in the bp file and
would be overridden anyway.
Test: comment-only change
Change-Id: I6ad3263557ef67aa642672863eed82a312c2ab40
Add APEX com.android.tethering.apex for tethering module.
It have tethering apk now and would have jar and library
in follow up CL.
Bug:144320626
Test: build
Change-Id: Ie6158639886e90180dd90347e802a5fe062031b2