ASoC: wm_adsp: select CONFIG_SND_SOC_WM_ADSP from all users

ASoC: wm_adsp: select CONFIG_SND_SOC_WM_ADSP from all users

The addition of the kunit test made it possible to enable the WM_ADSP
driver even when there are no users. However, an unintended side-effect
was that it is also possible to turn it off when it is actually required,
leading to build failures:

ERROR: modpost: "wm_halo_init" [sound/soc/codecs/snd-soc-cs35l45.ko] undefined!
ERROR: modpost: "wm_adsp2_remove" [sound/soc/codecs/snd-soc-cs35l45.ko] undefined!
ERROR: modpost: "wm_adsp_hibernate" [sound/soc/codecs/snd-soc-cs35l45.ko] undefined!
ERROR: modpost: "wm_adsp2_component_probe" [sound/soc/codecs/snd-soc-cs35l45.ko] undefined!

Reverse the logic to replace the ununual list of 'default y if ....' with
the regular 'select' that do the same thing but prevent it from being
disabled if that would break the build.

Fixes: bf2d44d07de7 ("ASoC: wm_adsp: Add kunit test for firmware file search")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20260320151752.3439218-1-arnd@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>