buildinfo_prop module is a replacement for build/make/tools/buildinfo.sh
so other images like microdroid can refer to build.prop.
For now, buildinfo_prop only supports a few build.prop properties, and
it's only used in microdroid.
Bug: 189164487
Test: build
Change-Id: I120654ca23a68de414df8da2051c6677afbab441
