[PATCH] usbnet: zaurus, oops, etc

This patch:

- Removes Pavel's Zaurus-private crc32 code; the base patch
   was from Pavel.

- Addresses two issues Toby Milne reported against the Zaurus:
   (a) if skbs had extra framing added (z, net1080, gl620a),
       the original size (now too small) was used on tx;
   (b) added FLAG_FRAMING_Z so rx packets had enough space

- Removes an oops from the driver model conversion (saved
   the wrong pointer).  Disconnecting wasn't healthy.

- Forward-ports some ethtool support from the 2.4 version:
   PDAs are always connected, so report them that way.

- Stubs in some PXA-250 support for non-Zaurus PDAs.
   This is currently commented out; so far those PDAs
   only run Linux for bleeding edge developers.

- Minor cleanups.