Merge "libsnapshot: Remove ISnapshotWriter." am: 8542f3e4bb am: 809b55c4b2 am: 4b532ccae8

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2585086

Change-Id: I2a2e801a080c726bb360bd53f14d84ba6c37eea2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>