Autosuspend works until you bring the wwan interface up, then the
device does not enter autosuspend anymore.

The following patch fixes the problem by setting the .manage_power
field in the mbm_info struct to the same as in the cdc_info struct
(cdc_manager_power).
Signed-off-by: Torgny Johansson <torgny.johansson@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>