Merge "Add filegroup_defaults module" am: a8c1cacaf9 am: 03c2e249ee

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2470485

Change-Id: I21858217d479720735df11dbc8833c24d5d4d1bf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>