ASoC: codecs: wcd938x: use defines for entries in snd_soc_dai_driver array

ASoC: codecs: wcd938x: use defines for entries in snd_soc_dai_driver array

snd_soc_dai_driver array in wcd938x driver has two entries whose order
must match order of wcd938x->sdw_priv array.  The wcd938x_bind() and
wcd938x_codec_set_sdw_stream() rely on this order.  wcd938x->sdw_priv
array is indexed by enum with AIF1_PB and AIF1_CAP, so use the same
defines instead of raw numners for snd_soc_dai_driver array.
No functional impact.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231019144108.42853-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>