Revert "virtio-blk: don't keep queue frozen during system suspend"

This reverts commit 12c0ddd6 which is
commit 7678abee upstream.

It breaks the Cuttlefish virtual target and prevetns it from working, so
revert it for now.

Change-Id: I95156a64edd241a9b01d937c6b7795eb0e5a634f
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>