ASoC: rt5640: Fix duplicate clock properties in DT binding

Not quite overlapping changes to the rt5640 binding resulted in duplicate
definitions of the clocks and clock-names properties. Delete one of them,
preferring the simpler one.

Reported-by: Jon Hunter <[e-mail]>
Closes: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/realtek,rt5640.yaml

···
       - realtek,rt5640
       - realtek,rt5639
 
-  clocks:
-    items:
-      - description: phandle and clock specifier for codec MCLK.
-
-  clock-names:
-    items:
-      - const: mclk
-
   reg:
     maxItems: 1