Move location provider lib to frameworks/ex so it can be re-used in
GmsCore.
This is the frameworks/base part of the change (1).
Change-Id: Ifc31a6809876e9c9afb6ed841b66cf06de7e8964
First part, adding the existing classes in their new library. The old
code will be removed once everything gets switched to using this.
Change-Id: I27b6ad8c75c16f35300090e95f12a7db5608e3a3