ASoC: tegra20: i2s: Use devm_clk_get()

Use resource-managed variant of clk_get() to simplify code.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20210314154459.15375-11-digetx@gmail.com


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