net: ethernet: mtk_ppe: add RCU lock around dev_fill_forward_path

[ Upstream commit 62c30c54 ]

Ensure ndo_fill_forward_path() is called with RCU lock held.

Fixes: 2830e314 ("net: ethernet: mtk-ppe: fix traffic offload with bridged wlan")
Signed-off-by: Qingfang Deng <dqfext@gmail.com>
Link: https://patch.msgid.link/20250814012559.3705-1-dqfext@gmail.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>