ASoC: dt-bindings: Add Cirrus Logic CS48L32 audio DSP

ASoC: dt-bindings: Add Cirrus Logic CS48L32 audio DSP

The CS48L32 is an Audio DSP with microphone inputs and SPI
control interface. It has a programmable DSP and a variety of
power-efficient fixed-function audio processors, with configurable
digital mixing and routing.

Most properties are core properties: supply regulators, gpios, clocks,
interrupt parent and SPI interface. The custom properties define
the configuration of the microphone inputs to match what is physically
attached to them.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: "Rob Herring (Arm)" <robh@kernel.org>
Link: https://patch.msgid.link/20250415115016.505777-2-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>