Do not use extended sleep registers unless HW-reduced bit is set.

Previous implementation incorrectly used the ACPI 5.0 extended sleep
registers if they were simply populated. This caused problems on some
non-HW-reduced machines. As per the ACPI spec,
they should only be used if the HW-reduced bit is set.
Lv Zheng, ACPICA BZ 1020.
AcpiExec: Correctly implement -h option.

'h' was not in the option list and thus did not work.