pata_it821x: Fix regression/corruptor

Whoever did the PCI revision patch slipped up on the it821x, and I
didn't spot this at the time either.  They moved the check for the
errata from the 0x10 revision to 0x11.  Put it back

This one is important for 2.6.23 final as in some cases bad things will
occur if 0x10 revision boards don't get the fixups.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>