ACPI support for SATA/PATA

Hello, all

In ACPI spec 3.0, section 9.9 defines 4 objects for PATA/SATA:

_GTM and _STM are PATA-only objects, which are used to get/set PATA
timing information(i.e. PIO and DMA speed);
_SDD is SATA-only object, which is used to inform the platform of the
type of device attached to a port;
_GTF is for both PATA and SATA, which is used to return ATA task file
needed to re-init the drive

In this patch set, 
ata_acpi_get_timing() is for getting PATA timing information;
ata_acpi_push_timing() is for setting PATA timing information;
ata_acpi_push_id() is for operating on _SDD;
ata_acpi_exec_tfs() is for getting ATA task file from _GTF and executing
them for a given drive

NOTE: ata_acpi_get_timing() and ata_acpi_push_timing() are channel
(port)-level operations, which have more suitable invocation place in
Tejun's upcoming PM patch. So I would not bother to reference(invoke)
them in this version of patches and will send out updated patches after
Tejun's PM patch is merged into #upstream.

Randy,
I'll add your sign-off line after you review the patch.

Thanks,
Forrest
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