Add RequiresApi annotations to LocationProvider

Ensures that lint tests can run properly from client code which uses
this library.

Bug: 130188099
Test: manual
Merged-In: I1d3c8e486c38633d73c405f2c6f9b350ef1e6946
(cherry picked from commit 44efeaef4da29e1d0a9add7b89151ff0f12ff148)
Change-Id: I1d3c8e486c38633d73c405f2c6f9b350ef1e6946
4 files changed