arm: dts: bcm2711: Describe Ethernet LEDs

arm: dts: bcm2711: Describe Ethernet LEDs

Describe the Ethernet LEDs for the Raspberry Pi 4 model B board as well
as the Raspberry Pi 4 CM board. The Raspberry Pi 400 board does not
include RJ45 connector LEDs so the 'leds' node is deleted accordingly.

The Ethernet PHY LEDs are numbered in the PHY package/pin list from LED1
through LED4, however their address within the LED registers function
selector is 0-indexed.

Link: https://lore.kernel.org/r/20240423191500.1443636-1-florian.fainelli@broadcom.com
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Stefan Wahren <wahrenst@gmx.net>