Multiple rfkill knobs for the same hardware interface

[Andrey Borzenkov <arvidjaar@mail.ru>]

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This is mostly the same situation as ACPI vs. platform backlight 
control. Here on Dell XPS M1330:

{pts/1}% rfkill list
0: dell-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: dell-bluetooth: Bluetooth
        Soft blocked: no
        Hard blocked: no
2: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
4: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no

Arguably, either one in the pair is redundant. Moreover, hard disabling 
wireless (using slider on notebook side):

{pts/1}% rfkill list
0: dell-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: dell-bluetooth: Bluetooth
        Soft blocked: no
        Hard blocked: no
2: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: yes

So dell-laptop actually lies claiming that both radios are enabled. Even 
if this is a bug that can be fixed, having two knobs for exactly the 
same piece of hardware is confusing at the very least.

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