Huawei HG253s v2 is a BCM6362 with 128M RAM, internal wifi and external
BCM53124S switch.
This device is already supported in bcm63xx target, so more information can be
found in https://openwrt.org/toh/huawei/hg253s_v2.
It's a perfect example of a device with internal and external switch
coexistance since most devices only have ports on one of the switches but not
both of them.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>