ata: Flush cache before standby and activate
ata: Flush cache before standby and activate

I had thought this should be implicit from standby immediate command
but it isn't.

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