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.com


Signed-off-by: Mark Brown <broonie@kernel.org>