Add vhost-user snapshot support to wmediumd am: 89da3783ed am: 33c3daeb09 am: db58ebf752

Original change: https://android-review.googlesource.com/c/platform/external/wmediumd/+/2759933

Change-Id: I76084f413237b61c2e03a652a20da585086814dd
Signed-off-by: Automerger Merge Worker <[email protected]>