On the devices with PoE support, the secondary UART (uart1) on the SoC
is used to communicate between the SoC and controller.
Enable the secondary UART on the following devices:
- D-Link DGS-1210-10P
- Netgear GS110TPP v1
- Netgear GS310TP v1
- ZyXEL GS1900-8HP v1/v2
- ZyXEL GS1900-10HP
- ZyXEL GS1900-24HP v2
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>