dpaa_eth: rename current skb A050385 erratum workaround

Explicitly point that the current workaround addresses skbs. This change is
in preparation for adding a workaround for XDP scenarios.

Acked-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>