Ralink rt2501/rt61 rfkill support

configname: CONFIG_RT61PCI_RFKILL

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Ralink rt2501/rt61 rfkill support
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
This adds support for integrated rt61 hardware that features a
hardware button to control the radio state.
This feature depends on the RF switch subsystem rfkill.