ACPI: quiet ACPI Exceptions due to no _PTC or _TSS

ACPI Exception (processor_throttling-0084): AE_NOT_FOUND, Evaluating _PTC [20070126]
ACPI Exception (processor_throttling-0147): AE_NOT_FOUND, Evaluating _TSS [20070126]

These methods are optional, so Linux should not
alarm users when they are not found.

http://bugzilla.kernel.org/show_bug.cgi?id=8802



Signed-off-by: Len Brown <len.brown@intel.com>
Acked-by: Luming Yu <luming.yu@intel.com>