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.de


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