wifi: wilc1000: split deeply nested RCU list traversal in dedicated helper

Move netif_wake_queue and its surrounding RCU operations in a dedicated
function to clarify wilc_txq_task and ease refactoring

Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240215-wilc_fix_rcu_usage-v1-1-f610e46c6f82@bootlin.com