block: Drop last of the sector-based aio callbacks

We are gradually moving away from sector-based interfaces, towards
byte-based.  Now that all drivers with aio callbacks are using the
byte-based interfaces, we can remove the sector-based versions.

Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2 files changed