ASoC: cs35l56: Use standard SoundWire regmap implementation

Use the regmap_sdw implementation for SoundWire instead of
re-implementing the low-level bus transactions in cs35l56-sdw.c

The cs35l56 registers are big-endian on I2C and SPI but little-endian
over SoundWire. The firmware files are all big-endian and contain opaque
blobs in big-endian order. So these must be endian-swapped to transfer
over SoundWire. A custom regmap bus implementation is used to do this
endian-swapping.

The original implementation of this custom regmap bus was a complete bus
backend, performing the endian swapping and low-level SoundWire bus
read/write.

This commit changes the custom regmap bus to only perform the endian-swap.
It uses an underlying simple uncached regmap_sdw bus to deal with
transferring the 32-bit registers over the SoundWire bus. Although this
adds a small amount of overhead, from passing through the regmap APIs
twice, it avoids having a local duplicate implementation of what regmap_sdw
already does.

The slow-read handling for OTP registers must access 8-bit SoundWire
registers so it still uses low-level SoundWire bus reads.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20260519135435.479949-4-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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