dt-bindings: mfd: syscon: Add i.MX93 blk ctrl system registers

Document i.MX93 BLK CTRL system registers.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/mfd/syscon.yaml

@@ -40,6 +40,8 @@ properties:
               - allwinner,sun50i-a64-system-controller
               - brcm,cru-clkset
               - freecom,fsg-cs2-system-controller
+              - fsl,imx93-aonmix-ns-syscfg
+              - fsl,imx93-wakeupmix-syscfg
               - hisilicon,dsa-subctrl
               - hisilicon,hi6220-sramctrl
               - hisilicon,pcie-sas-subctrl