hwtracing: use for_each_endpoint_of_node()

We already have for_each_endpoint_of_node(), don't use
of_graph_get_next_endpoint() directly. Replace it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/878qyl970c.wl-kuninori.morimoto.gx@renesas.com