libata: Add the AHCI_HFLAG_YES_ALPM flag
Some hardware is capable of supporting Aggresive Link Power Management even though it is not indicated by the Host Capability register. This commit adds the AHCI_HFLAG_YES_ALPM flag to the AHCI library to allow indication of this quirk when the Host Capability register is Read Only and therefore cannot be changed. Signed-off-by: NDoug Berger <opendmb@gmail.com> Signed-off-by: NTejun Heo <tj@kernel.org>
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