Revert "[PATCH] i386/x86_64: Force pci=noacpi on HP XW9300"

This reverts commit 5491d0f3

.

As per Andi:

  "After some discussion with people who have the affected system it
   seems best to revert for 2.6.17.  It broke a common BIOS workaround
   and PCI-X still doesn't work.  Alternative is for people to change
   the BIOS which seems to be better right now."

Signed-off-by: Linus Torvalds <torvalds@osdl.org>