ASoC: tas2770: Convert bit mask to GENMASK in header

Update the hardcoded masks with the GENMASK macro. Also update some of
the hardcoded bits with the BIT macro

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200918190548.12598-6-dmurphy@ti.com


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