wimax connection manager / daemon has to know what is current
state of the device. Previously it was only possible to get
notification whet state has changed.

Note:

By mistake, the new generic netlink's number for
WIMAX_GNL_OP_STATE_GET was declared inserting into the existing list
of API calls, not appending; thus, it'd break existing API.

Fixed by Inaky Perez-Gonzalez by moving to
the tail, where we add to the interface, not modify the interface.

Thanks to Stephen Hemminger for catching this.

Signed-off-by: Paulius Zaleckas