ACPI: remove Asus P2B-DS from acpi=ht blacklist

We realized when we broke acpi=ht
http://bugzilla.kernel.org/show_bug.cgi?id=14886


that acpi=ht is not needed on this box
and folks have been using acpi=force on it anyway.

Signed-off-by: Len Brown <len.brown@intel.com>