dt-bindings: dma: owl: Add compatible string for Actions Semi S500 SoC

Add a new compatible string corresponding to the DMA controller found
in the S500 variant of the Actions Semi Owl SoCs family. Additionally,
order the entries alphabetically.

Signed-off-by: Cristian Ciocaltea <[e-mail]>
Reviewed-by: Manivannan Sadhasivam <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/2bd23ef5da[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

Documentation/devicetree/bindings/dma/owl-dma.yaml

···
 
 description: |
   The OWL DMA is a general-purpose direct memory access controller capable of
-  supporting 10 and 12 independent DMA channels for S700 and S900 SoCs
-  respectively.
+  supporting 10 independent DMA channels for the Actions Semi S700 SoC and 12
+  independent DMA channels for the S500 and S900 SoC variants.
 
 maintainers:
   - Manivannan Sadhasivam <[e-mail]>
···
 properties:
   compatible:
     enum:
-      - actions,s900-dma
+      - actions,s500-dma
       - actions,s700-dma
+      - actions,s900-dma
 
   reg:
     maxItems: 1