Use front LED as IDE LED by default

configname: CONFIG_ADB_PMU_LED_IDE

Linux Kernel Configuration
└─>Device Drivers
└─>Macintosh device drivers
└─>Use front LED as IDE LED by default
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This option makes the front LED default to the IDE trigger
so that it blinks on IDE activity.