block: drop bdrv_set_key from BlockDriver
This is not used anymore since c01c214b ("block: remove all encryption handling APIs", 2017-07-11). Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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