Merge "libfs_avb: Allow overriding the slot suffix." into main am: 30b1c4dd...

Merge "libfs_avb: Allow overriding the slot suffix." into main am: 30b1c4dd am: 8e60a8d6 am: 19373115 am: 8d73ba78

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2587226



Change-Id: I0eed149dd7d3a39898d04250af2c078f951198b0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>