Removal of devfs support from MTD

[Ryan B. Lynch]

I don't know if anybody else is still stuck in the time-warp that is
devfs, compiling kernels on parchment and generally being obsolete.  But
since I spent 2 hours last night trying to figure out why my device
nodes stopped appearing after I applied the latest MTD patches, I
thought I'd make a public service announcement.

(For what it's worth, the upgrade to Udev was totally
painless--everything works like it always should have.)

-Ryan