dt-bindings: perf: fsl-imx-ddr: Add i.MX8DXL compatible

Add a compatible for i.MX8DXL which is compatile with "fsl,imx8-ddr-pmu".
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20231120093317.2652866-3-xu.yang_2@nxp.comSigned-off-by: Will Deacon <will@kernel.org>

Documentation/devicetree/bindings/perf/fsl-imx-ddr.yaml

@@ -27,6 +27,9 @@ properties:
               - fsl,imx8mq-ddr-pmu
               - fsl,imx8mp-ddr-pmu
           - const: fsl,imx8m-ddr-pmu
+      - items:
+          - const: fsl,imx8dxl-ddr-pmu
+          - const: fsl,imx8-ddr-pmu
 
   reg:
     maxItems: 1