ASoC: tegra: tegra_rt5640: use devm_snd_soc_register_card()

Using devm_snd_soc_register_card() can make the code
shorter and cleaner.

Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Link: https://lore.kernel.org/r/20200929112936.47441-1-miaoqinglang@huawei.com


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