bearer-qmi: fix dual-stack connections

Connecting the second family of a dual stack connections fails with 'PolicyMismatch' when muxing is setup after family selection.

Switching the order of the family selection and muxing setup to fix the problem. Looks like family selection must be the very last WDS request before connecting the client.

Signed-off-by: Bjørn Mork bjorn@mork.no