This enables sharing of platform constraints between platform and kernel builds.
Bug: 304594734
Test: treehugger
Change-Id: I48091eeaf2e529c3f180ba056da3935911868b14
Ignore-AOSP-First: ag/24746588, in the same topic, is in an internal repo. This CL will be cherry-picked to AOSP afterward.
Test: go test
Bug: 277091218
Change-Id: I389d9535ea176991a1faa9beb46352b93363acd2
Merged-In: I389d9535ea176991a1faa9beb46352b93363acd2