Merge branch 'increase-maximum-mtu-to-9k-for-airoha-en7581-soc'

Lorenzo Bianconi says:

====================
Increase maximum MTU to 9k for Airoha EN7581 SoC

EN7581 SoC supports 9k maximum MTU.
Enable the reception of Scatter-Gather (SG) frames for Airoha EN7581.
Introduce airoha_dev_change_mtu callback.
====================

Link: https://patch.msgid.link/20250304-airoha-eth-rx-sg-v1-0-283ebc61120e@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>