[PATCH] libata: separate out sata_phy_resume() from sata_std_hardreset()

This patch separates out sata_phy_resume() from sata_std_hardreset().
The function will later be used by probeinit callback.

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