ASoC: samsung: Mark unused Odroid compatibles as deprecated

Compatible for XU4 audio is not being used.  Instead the board uses the
same compatible as XU3.  The devices are now just compatible so they
should use the same value.  Mark "hardkernel,odroid-xu4-audio" as being
deprecated so in this future could be removed to limit useless
properties.

Additionally add older compatibles appearing in the bindings.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/samsung,odroid.txt

@@ -3,7 +3,9 @@ Samsung Exynos Odroid XU3/XU4 audio complex with MAX98090 codec
 Required properties:
 
  - compatible - "hardkernel,odroid-xu3-audio" - for Odroid XU3 board,
-		"hardkernel,odroid-xu4-audio" - for Odroid XU4 board
+		"hardkernel,odroid-xu4-audio" - for Odroid XU4 board (deprecated),
+		"samsung,odroid-xu3-audio" - for Odroid XU3 board (deprecated),
+		"samsung,odroid-xu4-audio" - for Odroid XU4 board (deprecated)
  - model - the user-visible name of this sound complex
  - clocks - should contain entries matching clock names in the clock-names
     property