[PATCH] libata: implement ata_std_probeinit()

This patch implements the off-the-shelf probeinit component operation.
Currently, all it does is waking up the PHY if it's a SATA port.

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