ASoC: tegra: fix device_node refcounting

tegra_rt5677_probe() gets a couple of device nodes with of_parse_phandle(),
but there is no release of them.

The patch adds the release to tegra_rt5677_remove() and
to error handling paths in the probe.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Reviewed-by: Nicholas Mc Guire <der.herr@hofr.at>
Signed-off-by: Mark Brown <broonie@kernel.org>