This patch completely rewrites the rfkill core to address
the following deficiencies:

* all rfkill drivers need to implement polling where necessary
rather than having one central implementation

* updating the rfkill state cannot be done from arbitrary
contexts, forcing drivers to use schedule_work and requiring
lots of code

* rfkill drivers need to keep track of soft/hard blocked
internally -- the core should do this

* the rfkill API has many unexpected quirks, for example being
asymmetric wrt. alloc/free and register/unregister

* rfkill can call back into a driver from within a function the
driver called -- this is prone to deadlocks and generally
should be avoided

* rfkill-input pointlessly is a separate module

* drivers need to #ifdef rfkill functions (unless they want to
depend on or select RFKILL) -- rfkill should provide inlines
that do nothing if it isn't compiled in

* the rfkill structure is not opaque -- drivers need to initialise
it correctly (lots of sanity checking code required) -- instead
force drivers to pass the right variables to rfkill_alloc()

* the documentation is hard to read because it always assumes the
reader is completely clueless and contains way TOO MANY CAPS

* the rfkill code needlessly uses a lot of locks and atomic
operations in locked sections

* fix LED trigger to actually change the LED when the radio state
changes -- this wasn't done before

Tested-by: Alan Jenkins
Signed-off-by: Henrique de Moraes Holschuh [thinkpad]
Signed-off-by: Johannes Berg
Signed-off-by: John W. Linville