ata: libahci_platform: comply to PHY framework

ata: libahci_platform: comply to PHY framework

Current implementation of the libahci does not take into account the
new PHY framework. Correct the situation by adding a call to
phy_set_mode() before phy_power_on().

PHYs should also be handled at suspend/resume time. For this, call
ahci_platform_enable/disable_phys() at suspend/resume_host() time. These
calls are guarded by a HFLAG (AHCI_HFLAG_SUSPEND_PHYS) that the user of
the libahci driver must set manually in hpriv->flags at probe time. This
is to avoid breaking users that have not been tested with this change.

Reviewed-by: Hans de Goede <[email protected]>
Suggested-by: Grzegorz Jaszczyk <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>