spi: Use 'flash' node name instead of 'spi-flash' in example

Change the nodename in the example with spi-nand from 'spi-flash@1'
to 'flash@1' to make the schema uniform with both spi-nand and spi-nor
flashes. jedec,spi-nor.yaml uses 'flash@' nodename for spi-nor flashes,
so make the spi-nand examples in dt-bindings use it too for uniformity.

Signed-off-by: Apurva Nandan <[email protected]>
Reviewed-by: Serge Semin <[email protected]>
Acked-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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