ASoC: SOF: imx: Add missing of_node_put() in imx8_probe()

This node pointer is returned by of_parse_phandle() with refcount
incremented in this function. of_node_put() on it before exiting
this function.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20210617032756.599359-1-yangyingliang@huawei.com


Signed-off-by: Mark Brown <broonie@kernel.org>