ARM: dts: bcm21664-garnet: use node labels

Use node labels instead of nodename@address for BCM21664 Garnet
to simplify its DTS file.

Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Link: https://lore.kernel.org/r/e9f1ac2e9aa0ef7e880b1c152cbd56ff6b151955.1685127525.git.stano.jakubek@gmail.com


Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>