[PATCHSET libata-dev#upstream] ata_piix: implement SIDPR SCR access

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This patchset implements SIDPR SCR access which is available for ICH8
and above.  With SIDPR SCR access enabled, ata_piix ports can access
PHY events and errors and can also be hardreset which is important as
in rare cases hardreset is necessary to recover from error conditions.

This patchset contains five patches.  The first two are misc clean up
patches.  3rd and 4th reorganize ata_piix initialization routine.  5th
implements SIDPR SCR access.

This patchset is against the current libat-dev#upstream (32a03e13).

Thanks.

--
tejun
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