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Load static RROs in OverlayManagerService
Only RROs targeting "android" are loaded from AssetManager, and so others should be loaded from OverlayManagerService. The RROs targeting "android" would be ingored as they are to avoid redundant loading. Bug: 76205654 Test: succeeded building and tested with taimen Change-Id: Ibeeb3c3f3338a845b2f4c485305636003d9dbd44