ARM: dts: exynos: Add sound support to Midas

Update the never-mainlined "samsung,trats2-audio" binding and instead
use the new "samsung,midas-audio" binding.

Signed-off-by: Simon Shields <simon@lineageos.org>
[s.nawrocki: fixed DAPM routing entries for MICBIAS1/2, adjusted to
 new cpu/codec binding, corrected the regulator nodes indexing]
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>