spi: Fix Tegra QSPI example

When running dt_binding_check on the nvidia,tegra210-quad.yaml binding
document the following error is reported ...

 nvidia,tegra210-quad.example.dt.yaml:0:0: /example-0/spi@70410000/flash@0:
 	failed to match any schema with compatible: ['spi-nor']

Update the example in the binding document to fix the above error.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Fixes: 9684752e ("dt-bindings: spi: Add Tegra Quad SPI device tree  binding")
Link: https://lore.kernel.org/r/20220307113529.315685-1-jonathanh@nvidia.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/nvidia,tegra210-quad.yaml

@@ -107,7 +107,7 @@ examples:
             dma-names = "rx", "tx";
 
             flash@0 {
-                    compatible = "spi-nor";
+                    compatible = "jedec,spi-nor";
                     reg = <0>;
                     spi-max-frequency = <104000000>;
                     spi-tx-bus-width = <2>;