Merge "adds LO_FLAGS_AUTOCLEAR for loop device of zram backing device" am: af09c15049 am: d50f25bed6 am: d23803f00a am: d4c7f3b28c

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1834393

Change-Id: Ia1a011246c990aa70ad2abf630dce63c8c9dad09