libata-acpi: add ACPI _PSx method
ACPI spec (ver 3.0a, p289) requires IDE power on/off executes ACPI _PSx methods. As recently most PATA drivers use libata, this patch adds _PSx method support in libata. ACPI spec doesn't mention if SATA requires the same _PSx method. Signed-off-by: NShaohua Li <shaohua.li@intel.com> Acked-by: NLen Brown <len.brown@intel.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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