spi: dt-bindings: nuvoton,wpcm450-fiu: Drop unrelated nodes from DTS example

Binding example should not contain other nodes, including other
providers like syscon, because this is redundant and only adds
unnecessary bloat.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: krzk

Documentation/devicetree/bindings/spi/nuvoton,wpcm450-fiu.yaml

@@ -59,8 +59,3 @@ examples:
         reg = <0>;
       };
     };
-
-    shm: syscon@c8001000 {
-      compatible = "nuvoton,wpcm450-shm", "syscon";
-      reg = <0xc8001000 0x1000>;
-    };