ASoC: dt-bindings: Document "samsung, arndale-wm1811" compatible

Add compatible string for boards with WM1811 CODEC to the list.

Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Link: https://lore.kernel.org/r/20190920130218.32690-7-s.nawrocki@samsung.com


Signed-off-by: Mark Brown <broonie@kernel.org>