i2400m: host/device procotol and core driver definitions

The wimax/i2400m.h defines the structures and constants for the
host-device protocols:

 - boot / firmware upload protocol

 - general data transport protocol

 - control protocol

It is done in such a way that can also be used verbatim by user space.

drivers/net/wimax/i2400m.h defines all the APIs used by the core,
bus-generic driver (i2400m) and the bus specific drivers
(i2400m-BUSNAME). It also gives a roadmap to the driver
implementation.

debug-levels.h adds the core driver's debug settings.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>