spi: dt-bindings: cdns,qspi-nor: Drop label in example

The label is useless here. Plus, if there are several examples with the
same label, we'll get very useless yet annoying warnings.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Miquel Raynal (Schneider Electric) <miquel.raynal@bootlin.com>
Tested-by: Santhosh Kumar K <s-k6@ti.com>
Link: https://patch.msgid.link/20260122-schneider-6-19-rc1-qspi-v4-1-f9c21419a3e6@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: miquelraynal

Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml

@@ -172,7 +172,7 @@ unevaluatedProperties: false
 
 examples:
   - |
-    qspi: spi@ff705000 {
+    spi@ff705000 {
         compatible = "intel,socfpga-qspi", "cdns,qspi-nor";
         #address-cells = <1>;
         #size-cells = <0>;