ASoC: samsung: Add HDMI audio support for Snow

This patch updates the driver so, in addition to current DT bindings, it
also can also use the new DT bindings with cpu, codec subnodes which allow
to support sound on the HDMI interface.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>