Enable LED support in iwlagn and iwl3945 drivers

configname: CONFIG_IWLWIFI_LEDS

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Enable LED support in iwlagn and iwl3945 drivers
In linux kernel since version 2.6.26 (release Date: 2008-07-13)