wimax: Add netlink interface to get device state

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 <inaky@linux.intel.com> by moving to
 the tail, where we add to the interface, not modify the interface.

 Thanks to Stephen Hemminger <shemminger@vyatta.com> for catching this.

Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>

net/wimax/debug-levels.h

@@ -36,6 +36,7 @@ enum d_module {
 	D_SUBMODULE_DECLARE(op_msg),
 	D_SUBMODULE_DECLARE(op_reset),
 	D_SUBMODULE_DECLARE(op_rfkill),
+	D_SUBMODULE_DECLARE(op_state_get),
 	D_SUBMODULE_DECLARE(stack),
 };