[automerger skipped] Block and wait for /dev/block/loop<N> to appear in case it was created asynchronously. am: 5ba8aeaa80 -s ours am: 87bf96a60e -s ours am: 459685a077 -s ours am: 7612a941c6 -s ours

am skip reason: Change-Id Id8616804bba622226ca21b8eff0d3eb577b4b7e0 with SHA-1 5ba8aeaa80 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/vold/+/10870751

Change-Id: I472bbc0b7ef634942e540c40a147db53e2d08b2c