[PATCH] libata: fix ata_std_probe_reset() SATA detection

ap->cbl is initialized during postreset and thus unknown on entry to
ata_std_probe_reset().  This patch makes ata_std_probe_reset() use
ATA_FLAG_SATA flag instead of ap->cbl to detect SATA port.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>