ASoC: codecs: wcd937x: Move max port number defines to enum

ASoC: codecs: wcd937x: Move max port number defines to enum

Instead of having separate define to indicate number of TX and RX
Soundwire ports, move it to the enums defining actual port
indices/values.  This makes it more obvious why such value was chosen as
number of TX/RX ports.
Note: the enums start from 1, thus number of ports equals to the last
vaue in the enum.

WCD937X_MAX_SWR_PORTS is used in one of structures in the header, so
entire enum must be moved to the top of the header file.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patch.msgid.link/20240725-asoc-wsa88xx-port-arrays-v1-5-80a03f440c72@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>