arm64: dts: broadcom: bcm4908: add TP-Link Archer C2300 V1

Archer C2300 V1 is a home router based on the BCM4906 (2 CPU cores). It
has 512 MiB of RAM, NAND flash, USB 2.0 and USB 3.0 ports, 4 LAN ports,
1 WAN port.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>