ASoC: tas2562: Update shutdown GPIO property

Update the shutdown GPIO property to be shutdown from shut-down.

Fixes: c173dba4

 ("ASoC: tas2562: Introduce the TAS2562 amplifier")
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200624174932.9604-3-dmurphy@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>