io_uring/rsrc: remove '->ctx_ptr' of 'struct io_rsrc_node'

Remove '->ctx_ptr' of 'struct io_rsrc_node', and add 'type' field,
meantime remove io_rsrc_node_type().

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20241107110149.890530-3-ming.lei@redhat.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>