ata: ahci: Add BAR index quirk for Cavium PCI SATA device

For SATA controller found on OcteonTX SoC's, use non-standard PCI BAR0
instead of BAR5.

Signed-off-by: Suneel Garapati <sgarapati@marvell.com>
Reviewed-by: Simon Glass <sjg@chromium.org>