Assign LED numbers properly by adding function-enumerator property in DTS.
While at it, remove default trigger of LAN LEDs as it will be handled in
01_leds anyway.
Fixes: 51b9aef553a8 ("ipq40xx: add support for ASUS RT-ACRH17/RT-AC42U")
Signed-off-by: Sungbo Eo <mans0n@gorani.run>