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 <matthew.gerlach@altera.com>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

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

@@ -1,15 +0,0 @@
-Altera SOCFPGA SDRAM Error Detection & Correction [EDAC]
-The EDAC accesses a range of registers in the SDRAM controller.
-
-Required properties:
-- compatible : should contain "altr,sdram-edac" or "altr,sdram-edac-a10"
-- altr,sdr-syscon : phandle of the sdr module
-- interrupts : Should contain the SDRAM ECC IRQ in the
-	appropriate format for the IRQ controller.
-
-Example:
-	sdramedac {
-		compatible = "altr,sdram-edac";
-		altr,sdr-syscon = <&sdr>;
-		interrupts = <0 39 4>;
-	};

Documentation/devicetree/bindings/edac/altr,socfpga-ecc-manager.yaml

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