ASoC: dt-bindings: wcd937x-sdw: Add static channel mapping support

Add static channel mapping between master and slave rx/tx ports for
Qualcomm wcd937x soundwire codec.

Currently, the channel map index value for each soundwire port is
hardcoded in the wcd937x-sdw driver, and the same channel map index
value is configured in the soundwire master.

The Qualcomm board like the QCM6490-IDP require static channel map
settings for the soundwire master and slave ports.

If another boards which are using enable wcd937x, the channel mapping
index values between master and slave may be different depending on the
board hw design and requirements. If the above properties are not used
in a SoC specific device tree, the channel mapping index values are set
to default.

With the introduction of the following channel mapping properties, it is
now possible to configure the master channel mapping directly from the
device tree.

The qcom,tx-channel-mapping property specifies the static channel mapping
between the slave and master tx ports in the order of slave port channels
which is adc1, adc2, adc3, adc4, dmic0, dmic1, mbhc, dmic2, dmic3, dmci4,
dmic5, dmic6, dmic7.

The qcom,rx-channel-mapping property specifies the static channel mapping
between the slave and master rx ports in the order of slave port channels
which is hph_l, hph_r, clsh, comp_l, comp_r, lo, dsd_r, dsd_l.

Signed-off-by: Mohammad Rafi Shaik <quic_mohs@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20250206112225.3270400-2-quic_mohs@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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