Release 4.4.18-openpower1

 - v4.4.18 stable release
 - drop scsi: ignore errors from scsi_dh_add_device() as this is
   upstream
 - drop drivers/drm/ast: Update VGA Ownership register value as
   this was found to not fix the issue it was claimed to have fixed

Signed-off-by: Joel Stanley <joel@jms.id.au>
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