Changes to enable inclusion in the geotz apex

Anchor the API level the library is compiled against and allow the
library to be included in the geotz APEX.

The choice of API level 30 is arbitrary - it could be lower but it
doesn't need to be.

Bug: 152746105
Test: build
Change-Id: I7a4cd0b476a8829cd3ff0e88441cc3398268d9fb
1 file changed