ASoC: cs35l56: Replace open-coded SoundWire regmap with generic regmap-sdw

Richard Fitzgerald <rf@opensource.cirrus.com> says:

This series replaces the entirely custom SoundWire regmap with the generic
regmap-sdw. The reasons for doing this are:

- Avoid code duplication
- Avoid effort of keeping custom implementation up-to-date
- Prepare for supporting BRA

Link: https://patch.msgid.link/20260521115420.978616-1-rf@opensource.cirrus.com

diff --cc sound/soc/codecs/cs35l56-shared-test.c
Simple merge