dt-bindings: net: altr,socfpga-stmmac: Add compatible string for Agilex5

Add compatible string for the Altera Agilex5 variant of the Synopsys DWC
XGMAC IP version 2.10.

Signed-off-by: Matthew Gerlach <matthew.gerlach@altera.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250724154052.205706-2-matthew.gerlach@altera.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/devicetree/bindings/net/altr,socfpga-stmmac.yaml

@@ -11,8 +11,8 @@ maintainers:
 
 description:
   This binding describes the Altera SOCFPGA SoC implementation of the
-  Synopsys DWMAC for the Cyclone5, Arria5, Stratix10, and Agilex7 families
-  of chips.
+  Synopsys DWMAC for the Cyclone5, Arria5, Stratix10, Agilex5 and Agilex7
+  families of chips.
   # TODO: Determine how to handle the Arria10 reset-name, stmmaceth-ocp, that
   # does not validate against net/snps,dwmac.yaml.
 
@@ -23,6 +23,7 @@ select:
         enum:
           - altr,socfpga-stmmac
           - altr,socfpga-stmmac-a10-s10
+          - altr,socfpga-stmmac-agilex5
 
   required:
     - compatible
@@ -42,6 +43,9 @@ properties:
           - const: altr,socfpga-stmmac-a10-s10
           - const: snps,dwmac-3.74a
           - const: snps,dwmac
+      - items:
+          - const: altr,socfpga-stmmac-agilex5
+          - const: snps,dwxgmac-2.10
 
   clocks:
     minItems: 1