ata: send ATA standby immediate when activating firmware
ata: send ATA standby immediate when activating firmware

This should flush all remaining writes and make the drive safe to
update.

hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd