kernel: Fix unused-parameter warnings

Add missing ARG_UNUSED where needed.

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

kernel/queue.c

diff --git a/kernel/queue.c b/kernel/queue.c
index 0743597..7e6102e 100644
--- a/kernel/queue.c
+++ b/kernel/queue.c
@@ -88,6 +88,9 @@
 {
 #ifdef CONFIG_POLL
 	z_handle_obj_poll_events(&queue->poll_events, state);
+#else
+	ARG_UNUSED(queue);
+	ARG_UNUSED(state);
 #endif
 }