net: ethernet: ti: am65-cpsw: use lkml dma desc pool api

commit 93a76530 upstream.

Use lkml dma desc pool api to sync MCU CPSW code to LKML version as max as
possible. Used initial LKML commit to identify that code already upstream.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>