wifi-service: Move java_api_finder plugin to build rule with srcs

java_api_finder doesn't work if it is added to a
build rule without any `srcs`.

Bug: 147193292
Test: compiles
Change-Id: I88effc429e2c08f4a5b345fb9b43c0c03aa9d527
1 file changed
tree: f9002c3fc8a09e7656bc62ac899c77443a48a2e5
  1. apex/
  2. service/
  3. PREUPLOAD.cfg