net: dsa: b53: mmap: add more 63xx SoCs

BCM6318, BCM6362 and BCM63268 are SoCs with a B53 MMAP switch.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>