Fix the issue found that there is an extra space before a comma in the
volume control.

Fixes: bf726b1c ("ASoC: tas2562: Add support for digital volume control")
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200624174932.9604-4-dmurphy@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>