io_uring/kbuf: pass in struct io_buffer_list to commit/recycle helpers

io_uring/kbuf: pass in struct io_buffer_list to commit/recycle helpers

Rather than have this implied being in the io_kiocb, pass it in directly
so it's immediately obvious where these users of ->buf_list are coming
from.

Link: https://lore.kernel.org/r/20250821020750.598432-6-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>