vmm_vhost: update submodule to get warning fixes
vmm_vhost: update submodule to get warning fixes

Fixes Rust 1.53+ warnings when building crosvm:

  warning: lint `safe_packed_borrows` has been renamed to `unaligned_references`

BUG=None
TEST=cargo build

Change-Id: If2d2852e0fc20e6afd7fe8e712a2718b640f052b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3145915
Reviewed-by: Dennis Kempin <cd09796fb571bec2782819dbfd33307f65b1c778@google.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Commit-Queue: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm