net: airoha: Reset PPE cpu port configuration in airoha_ppe_hw_init()

net: airoha: Reset PPE cpu port configuration in airoha_ppe_hw_init()

Before this patch, the PPE cpu port configuration used for a specific GDM
device was set just running ndo_init() callback during the device
initialization. The selected PPE cpu port configuration depends on the QDMA
block assigned to the GDM port. The QDMA block is selected according to
the GDM port LAN/WAN configuration as specified in the commit
'8737d7194d6d ("net: airoha: select QDMA block according LAN/WAN
configuration"). However, the user selected PPE cpu port configuration can
be different with respect to the one hardcoded in the NPU firmware binary.
The hardcoded NPU PPE cpu port configuration is loaded initializing the PPE
engine running the NPU ops ppe_init() callback in airoha_ppe_offload_setup
routine (this is executed at runtime by the netfilter flowtable
infrastructure during flow offloading).
Reset the PPE cpu port configuration in airoha_ppe_hw_init routine in
order to apply the user requested setup according to the device DTS.
Please note this patch is fixing an issue not visible to the user (so we
do not need to backport it) since airoha_eth driver currently supports just
the internal phy available via the MT7530 DSA switch and there are no WAN
interfaces officially supported since PCS/external phy is not merged
mainline yet (it will be posted with following patches).

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260317-airoha-fix-ppe-def-cpu-v1-1-338533d8e234@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>