dts: vt8500: Add DT node for VIA Velocity driver.

Adds a DT node for the VIA Velocity network device found
on the VIA APC8750. I haven't found a seperate IC for the
network device, so assume it is built-in to the SoC.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
net: via: Add platform support for VIA Velocity network device

Create a copy of via-velocity driver as via-velocity-platform.c
and remove the PCI specific code, while adding support for probing
from a platform device.

Also, had to remove some eeprom code in velocity_init_registers which
seems to cause a hang on device open.

- mac_eeprom_reload(regs);
- for (i = 0; i < 6; i++)
-	writeb(vptr->dev->dev_addr[i], &(regs->PAR[i]));

I assume this is for a seperate EEPROM which stores some configuration
information. mac_eeprom_reload() hangs for far too long, presumably
because there is no EEPROM on the APC8750.

Add a DT binding as well.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>