net: ethernet: ti: Add XDP frame size to driver cpsw

The driver code cpsw.c and cpsw_new.c both use page_pool
with default order-0 pages or their RX-pages.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Link: https://lore.kernel.org/bpf/158945340875.97035.752144756428532878.stgit@firesoul