cmdprio: Introduce generic option definitions

cmdprio: Introduce generic option definitions

The definition of the per-I/O priority options for the io_uring and
libaio I/O engines are almost identical, differing only by the option
group and option data structure used.

Introduce the CMDPRIO_OPTIONS macro in engines/cmdprio.h to generically
define these options in the io_uring and libaio engines to simplify the
code.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Niklas Cassel <niklas.cassel@wdc.com>
Link: https://lore.kernel.org/r/20230721110510.44772-3-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>