dt-bindings: arm: altera: Drop socfpga-sdram-edac.txt

The contents of arm/altera/socfpga-sdram-edac.txt are already covered by
edac/altr,socfpga-ecc-manager.yaml except for the "altr,sdram-edac"
compatible string. Add the compatible and drop the old .txt binding doc.

Acked-by: Matthew Gerlach <[email protected]>
Signed-off-by: Rob Herring (Arm) <[email protected]>

Author: robherring

Documentation/devicetree/bindings/arm/altera/socfpga-sdram-edac.txt

@@ -53,6 +53,7 @@ properties:
     properties:
       compatible:
         enum:
+          - altr,sdram-edac
           - altr,sdram-edac-a10
           - altr,sdram-edac-s10