ASoC: cs-amp-lib-test: Don't select SND_SOC_CS_AMP_LIB

ASoC: cs-amp-lib-test: Don't select SND_SOC_CS_AMP_LIB

Depend on SND_SOC_CS_AMP_LIB instead of selecting it.

KUNIT_ALL_TESTS should only build tests for components that are
already being built, it should not cause other stuff to be added
to the build.

Fixes: 177862317a98 ("ASoC: cs-amp-lib: Add KUnit test for calibration helpers")
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20250411123608.1676462-3-rf@opensource.cirrus.com
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>