- Add ciphy for PHY modules produced by Cicada Semiconductor

- Add ciphy for PHY modules produced by Cicada Semiconductor
- Add vge(4) for VIA VT612x GigE, which may have ciphy as its PHY module
- Add vge(4) into GENERIC and LINT
- Add man page for vge(4)

Thank Bill Paul for his work on this driver.
Thank Sascha Wildner for preparing the man page.

Obtained-from: FreeBSD
Tested-by: herrgard <herrgard@gmail.com>
NOTE:
Although polling(4) is claimed to be supported by this driver, but it does not
work that well with vge(4) (extremely slow, ~7000ms for ping, as reported by
herrgard).