dt-bindings: stm32: add st,stm32mp25-syscfg compatible for syscon

Add the new syscon compatible for STM32MP25 syscfg = "st,stm32mp25-syscfg".
Reorder enum following ASCII oredering.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml

@@ -15,12 +15,13 @@ properties:
     oneOf:
       - items:
           - enum:
-              - st,stm32mp157-syscfg
-              - st,stm32mp151-pwr-mcu
-              - st,stm32-syscfg
               - st,stm32-power-config
+              - st,stm32-syscfg
               - st,stm32-tamp
               - st,stm32f4-gcan
+              - st,stm32mp151-pwr-mcu
+              - st,stm32mp157-syscfg
+              - st,stm32mp25-syscfg
           - const: syscon
       - items:
           - const: st,stm32-tamp