Move/rename stats_enums.proto's directory/name

Migrate stats_enums.proto to core/proto/android/stats/ directory for the
consistency with other enums file imported in atoms.proto

Test: mma
Change-Id: I79f068889ac5c34c6fd8c5966687669efb37d180
1 file changed
tree: 140ded1c14c269a6d448e1be26ae7ef5d3ad512d
  1. atom_field_options.proto
  2. atoms.proto