Update the way OMS records details about overlays

Use flags, since we keep introducing boolean traits which would
be wasteful to encode as booleans.

Bug: 69383160
Test: builds
Change-Id: Ic09ae1086c7afa039b5df11e4c8c968125784586
Merged-In: Ic09ae1086c7afa039b5df11e4c8c968125784586
(cherry picked from commit 9e19121a00b85d7618bf294f70afa0f205e3ac00)
2 files changed
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