osd: Remove aios_size argument from submit_batch

osd: Remove aios_size argument from submit_batch
Due to aios_size being a uint16 and the source value for the actual
call being an int there was a possible overflow. This was "fixed"
with an assert, however that still causes a crash.

This commit removes the need for aios_size completely by iterating
over the list and submitting it in max_iodepth batches.

Fixes: https://tracker.ceph.com/issues/46366
Signed-off-by: Robin Geuze <robin.geuze@nl.team.blue>
(cherry picked from commit f87db49b0013088f1c87802886c4c16ce47c5cc2)