libsnapshot: Add RecoveryCreateSnapshotDevices(device)

... that doesn't auto mount/umount /metadata.

Test: builds
Bug: 151983957
Change-Id: If525a82c1635ddef221e7be20763bc2f27d3c417
Merged-In: If525a82c1635ddef221e7be20763bc2f27d3c417
2 files changed