dt-bindings: mtd: spi-nor: Drop common properties

When redefining common properties does not bring any additional
information, just drop them from the SPI-NOR bindings because these
properties already are definied in mtd.yaml.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20221114090315.848208-10-miquel.raynal@bootlin.com