ASoC: rt1016: enable building

The rt1016 driver wasn't listed in Kconfig and Makefile, which AFAICT
means it isn't ever built. This patch adds the appropriate entries to
Kconfig and Makefile.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20220405171158.2168762-1-steve@sk2.org
Signed-off-by: Mark Brown <broonie@kernel.org>