ipq40xx: improve Netgear LBR20 LED config

ipq40xx: improve Netgear LBR20 LED config

This aligns the LED behaviour with other Orbi devices. Orbi devices have
multiple RBG LEDs at the top of the device and two status LEDs at the
back next to the barrel jack.
The current behaviour of other Orbi devices is to use the multi-color
LEDs at the top for status indication and the green/red LEDs at the back
for running/panic-indication. This matches the vendor behaviour except
the color choice.
Other devices use green as running, blue on upgrade, red on failsafe and
white on bootup, so this aligns the LBR20 behaviour to the rest.

Signed-off-by: Christoph Krapp <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20558
Signed-off-by: Robert Marko <[email protected]>