ACPICA: Distill multiple sleep method functions to a single function

ACPICA: Distill multiple sleep method functions to a single function

Adds acpi_hw_execute_sleep_method to handle the various sleep methods
such as _GTS, _BFS, _WAK, and _SST. Removes the specialized
functions previously used for each of these methods.

Signed-off-by: Bob Moore <[email protected]>
Signed-off-by: Lin Ming <[email protected]>
Signed-off-by: Len Brown <[email protected]>