thinkpad-acpi: enhanced debugging messages for rfkill subdrivers

Enhance debugging messages for all rfkill subdrivers in thinkpad-acpi.

Also, log a warning if the deprecated sysfs attributes are in use.
These attributes are going to be removed sometime in 2010.

There is an user-visible side-effect: we now coalesce attempts to
enable/disable bluetooth or WWAN in the procfs interface, instead of
hammering the firmware with multiple requests.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

Documentation/laptops/thinkpad-acpi.txt

@@ -1494,6 +1494,8 @@ to enable more than one output class, just add their values.
 				accessing some functions of the driver
 	0x0001			Initialization and probing
 	0x0002			Removal
+	0x0004			RF Transmitter control (RFKILL)
+				(bluetooth, WWAN, UWB...)
 
 There is also a kernel build option to enable more debugging
 information, which may be necessary to debug driver problems.