[PATCH] ASoC: sdca: Fix missing regmap dependencies in Kconfig

[Boris Faure]

The SDCA modules failed to build with modpost errors:

  ERROR: modpost: "__devm_regmap_init_sdw" [sound/soc/sdca/snd-soc-sdca-class.ko] undefined!
  ERROR: modpost: "__devm_regmap_init_sdw_mbq" [sound/soc/sdca/snd-soc-sdca-class-function.ko] undefined!

The issue occurs because:
- sdca_class.c calls devm_regmap_init_sdw() which requires REGMAP_SOUNDWIRE
- sdca_class_function.c calls devm_regmap_init_sdw_mbq_cfg() which requires REGMAP_SOUNDWIRE_MBQ

However, the Kconfig didn't select these dependencies, causing the symbols
to be unavailable when the SDCA modules are built.

Fix this by adding:
- select REGMAP_SOUNDWIRE to SND_SOC_SDCA_CLASS
- select REGMAP_SOUNDWIRE_MBQ to SND_SOC_SDCA_CLASS_FUNCTION

This ensures the required regmap drivers are enabled when building SDCA support.

Configuration after fix:
  CONFIG_SND_SOC_SDCA_CLASS=m
  CONFIG_SND_SOC_SDCA_CLASS_FUNCTION=m
  CONFIG_REGMAP_SOUNDWIRE=m
  CONFIG_REGMAP_SOUNDWIRE_MBQ=m

Signed-off-by: Boris Faure <boris@xxxxxx>
---
 sound/soc/sdca/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/sdca/Kconfig b/sound/soc/sdca/Kconfig
index fabb69a3450d..87ab2895096c 100644
--- a/sound/soc/sdca/Kconfig
+++ b/sound/soc/sdca/Kconfig
@@ -46,12 +46,14 @@ config SND_SOC_SDCA_CLASS
 	select SND_SOC_SDCA_FDL
 	select SND_SOC_SDCA_HID
 	select SND_SOC_SDCA_IRQ
+	select REGMAP_SOUNDWIRE
 	help
 	  This option enables support for the SDCA Class driver which should
 	  support any class compliant SDCA part.
 
 config SND_SOC_SDCA_CLASS_FUNCTION
 	tristate
+	select REGMAP_SOUNDWIRE_MBQ
 	help
 	  This option enables support for the SDCA Class Function drivers,
 	  these implement the individual functions of the SDCA Class driver.
-- 
2.52.0