quick hack to support "option VIMAGE" on USB Ethernet

[YAMAMOTO Shigeru]

Hi all,

I hope to use "option VIMAGE" on RaspberryPi.

So, I try to make a patch.
http://freebsd-current.os-hackers.jp/pub/FreeBSD/snapshots/20130812/raspberry-pi/patch-vimage-r254236.diff
#There is a SD image for RaspberryPi at same place.

But, I only test it for if_smsc driver on RaspberryPi.
I don't test other architectures/devices.

Please test my patch and suggest the way to support "option VIMAGE" on USB
devices, if you are interested in.

Thanks,
-------
YAMAMOTO Shigeru <shigeru at iij.ad.jp>