ASoC: Address es9356 build failures without CONFIG_SND_SOC_SDCA

Nathan Chancellor <nathan@kernel.org> says:

This series addresses the build failure I reported at [1]. The first
patch allows CONFIG_SND_SOC_SDCA to be selected by a user. The third
patch fixes the actual build failure by requiring CONFIG_SND_SOC_SDCA to
enable CONFIG_SND_SOC_ES9356. The second patch is a standalone clean up
to make the third patch diff cleaner. If there are any issues, please
let me know.

[1]: https://lore.kernel.org/20260518224657.GA536765@ax162/

Link: https://patch.msgid.link/20260526-es9356-dep-fixes-v1-0-39ac16f43d54@kernel.org