Move proto messages out of enum/ directory.
Test: make
Bug: b/184754707
Change-Id: Ia240c2608227c34d8caa0fa89d62a00bf2bb6908
Merged-In: Ia240c2608227c34d8caa0fa89d62a00bf2bb6908
The proto build rules are quite large and makes the top-level Android.bp
file difficult to navigate. Move them to a separate file.
Bug: 185128417
Test: m
Change-Id: I5719ba0fa8e03dcfca0cc32dc30db3f87ea4e3cd