arm64: dts: broadcom: bcmbca: bcm4908: add Netgear R8000P USB LED triggers

This device has 2 USB LEDs meant to be triggered by devices in relevant
USB ports.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Link: https://lore.kernel.org/all/20230228144520.21816-2-zajec5@gmail.com/


Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>