ACPI: Revert conflicting workaround for BIOS w/ mangled PRT entries

ACPI: Revert conflicting workaround for BIOS w/ mangled PRT entries

580d16220ef368caaf508a32373276578fcb451e
in Linux-2.6.21 worked around BIOS with mangled _PRT entries:
http://bugzilla.kernel.org/show_bug.cgi?id=6859

ad29ba64f10e6c403780d22b6a10f6c5a7cdca1c
worked around the same issue via ACPICA, and shipped in 2.6.27.

Unfortunately the two workarounds conflict:
http://bugzilla.kernel.org/show_bug.cgi?id=12270

So revert the Linux specific one.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>