Add if CONFIG_LEDS_ , correct leds' active_low setting and change LD6 trigger to timer

Add if CCONFIG_LEDS_* to avoid compiling error when required CONFIG parameter is not selected.
Corredt leds' setting data .active_low to fit actual status.
Change LD6 Trigger from ineffective ide-disk trigeger to timer trigger.
Timer trigger is effective when delay_on and delay_off is set.