ASoC: codecs: wcd938x: remove unused port-map reference

port_map field was added prior to adding static port map support in soundwire.
This makes port_map array in struct wcd938x_sdw_priv redundant and unused,
so remove this.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210716105612.5284-1-srinivas.kandagatla@linaro.org


Signed-off-by: Mark Brown <broonie@kernel.org>