kunit: configs: Add some Cirrus Logic modules to all_tests

kunit: configs: Add some Cirrus Logic modules to all_tests

Add CONFIG_I2C and CONFIG_SND_SOC_CS35L56_I2C to all_tests.config
so that Cirrus Logic modules with KUnit tests will be built.

The CS35L56 driver doesn't currently have any KUnit tests itself,
but it enables two other libraries that have KUnit tests:
cs_dsp and cs-amp-lib.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20250411123608.1676462-2-rf@opensource.cirrus.com
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>