The UWB radio manager coordinates the use of the radio between the
PALs that may be using it.  PALs request use of the radio with
uwb_radio_start() and the radio manager will start beaconing if its
not already doing so.  When the last PAL has called uwb_radio_stop()
beaconing will be stopped.

In the future, the radio manager will have a more sophisticated channel
selection algorithm, probably following the Channel Selection Policy
from the WiMedia Alliance when it is finalized.  For now, channel 9
(BG1, TFC1) is selected.

The user may override the channel selected by the radio manager and may
force the radio to stop beaconing.

The WUSB Host Controller PAL makes use of this and there are two new
debug PAL commands that can be used for testing.
Signed-off-by: NDavid Vrabel <david.vrabel@csr.com>

The pal parameter allows PALs to retrieve their PAL-specific data
structure.
Signed-off-by: NDavid Vrabel <david.vrabel@csr.com>

Add the commands UWB_DBG_CMD_IE_ADD and UWB_DBG_CMD_IE_RM to the debug
interface and make them call uwb_rc_ie_add() and uwb_rc_ie_rm().
Signed-off-by: NStefano Panella <stefano.panella@csr.com>
Signed-off-by: NDavid Vrabel <david.vrabel@csr.com>

Reference counting the struct uwb_rsv's is safer and easier to get right than
the transferring ownership of the structures from the PAL to reservation
manager.

This fixes an oops in the debug PAL after a reservation timed out.
Signed-off-by: NDavid Vrabel <david.vrabel@csr.com>

Add various debugfs files, principaly for the reservation manager.
Signed-off-by: NDavid Vrabel <david.vrabel@csr.com>