RDS: mark netdev UP for intfs added post module load

RDS: mark netdev UP for intfs added post module load

When interfaces are brought up after module load,
a NETDEV_UP event for which no matching port exists
triggers re-initialization of active bonding data
structures. The initialization however missed marking
the layer as up in flag tracking which layers are up.
The fix here marks that layer as UP in the flags since
the initialization is triggered by the NETDEV_UP event
processing!

Orabug: 20130536

Signed-off-by: Mukesh Kacker <mukesh.kacker@oracle.com>
Acked-by: Chien Yen < chien.yen@oracle.com>