Update ofpath for new devspec export in /proc

* ofpath: /proc/ide/pmac is dead, the OpenFirmware devspec is now
  exported to /proc/ide/ideX/devspec, ofpath now uses that.
  - this change is not tested, some additional sanity checks are still
    needed.
git-archimport-id: erbenson@alaska.net--public/yaboot--devel--1.3--patch-36
3 files changed