dt-bindings: mfd: syscon: Add amd,pensando-elba-syscon compatible

Add the AMD Pensando Elba SoC system registers compatible

Signed-off-by: Brad Larson <blarson@amd.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230119035136.21603-6-blarson@amd.com

Author: blarson866

Documentation/devicetree/bindings/mfd/syscon.yaml

@@ -38,6 +38,7 @@ properties:
               - allwinner,sun8i-h3-system-controller
               - allwinner,sun8i-v3s-system-controller
               - allwinner,sun50i-a64-system-controller
+              - amd,pensando-elba-syscon
               - brcm,cru-clkset
               - freecom,fsg-cs2-system-controller
               - fsl,imx93-aonmix-ns-syscfg