Add filegroup for compatibility matrix schema

... so that I can refer to it somewhere else.

Bug: 149929588
Test: builds
Change-Id: I7c62576e241172354b0b863948f98b942642e635
(cherry picked from commit d4685bb62998a23a05e3b424e608617e4bb2bf77)
Merged-In: I7c62576e241172354b0b863948f98b942642e635
1 file changed