Report mock locations in 2.0 default implementation

- Create android.hardware.gnss@common-default-lib for sharing common
default implementation code.
- Create android.hardware.gnss@common-vts-lib for sharing common VTS
code.

Bug: 121217686
Change-Id: I35c127c23d97ab9a5c6ee13b36fbfe9c3708e3f3
Fixes: 121217686
Test: tested on cuttlefish