Revert "x86: fix HPET regression in 2.6.26 versus 2.6.25, check hpet against BAR...

Revert "x86: fix HPET regression in 2.6.26 versus 2.6.25, check hpet against BAR, v3"

This reverts commit efa5f4bbcc4d92532b2e89c3d39a2555f905ba14.

It wasn't really right to begin with (there's a better fix for the
problem with e820 reservations clashing with PCI BAR's pending), but it
also actually causes more regressions, so it should be reverted even
before the better fix is finalized.

Rafael reports that this commit broke AHCI detection, and thus causes
the kernel to not boot on his quad core test box.

Reported-and-bisected-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: David Witbrodt <dawitbro@sbcglobal.net>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>