ASoC: tegra20: spdif: Correct driver removal order

Tegra20 SPDIF driver has a wrong driver removal order, which should be
opposite to the registration order, but it's not. In particular the
runtime PM is disabled in a wrong order. Fix the order.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20210314154459.15375-7-digetx@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>