ASoC: rt722-sdca: Make use of new expanded MBQ regmap

ASoC: rt722-sdca: Make use of new expanded MBQ regmap

Now the MBQ regmap implementation handles multiple sizes, this driver
can combine its two register maps into one. So remove mbq_regmap and
combine all the registers into regmap.

Also as rt722_sdca_adc_mux_get/put() only exist to access mbq_regmap,
rather than doing any processing, these can now be dropped and the
normal DAPM helpers used.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250107154408.814455-7-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>