ASoC: tegra: tegra20_das: Drop write-only driver data member

The dev member of struct tegra20_das is only written once in .probe().
There is no loss of functionality if the member and the assignment go away.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220629194224.175607-5-u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/tegra20_das.c

@@ -77,7 +77,6 @@
 #define TEGRA20_DAS_DAC_ID_3 2
 
 struct tegra20_das {
-	struct device *dev;
 	struct regmap *regmap;
 };
 
@@ -162,8 +161,6 @@ static int tegra20_das_probe(struct platform_device *pdev)
 	if (!das)
 		return -ENOMEM;
 
-	das->dev = &pdev->dev;
-
 	regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);