The same as for amiserial. Use only one instance of the flags.

Also remove them from async_struct now. Nobody else uses them.
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>