spi: dt-bindings: cdns,qspi-nor: Be more descriptive regarding what this controller is

Despite being very common in commit logs, SPI NOR controllers simply do
not exist. At least, they are not as specific as the name implies. There
are SPI memory controllers which are indeed "specialized" and optimized
for handling "memories", but most of them are just generic and accept
almost any kind of opcode, address, dummy and data cycles, making them
as suitable for NANDs than NORs.

Furthermore, this controller supports any kind of bus, from single to
octal NAND, so make it clear.

Also add a comment to mention that the initial compatible naming is too
specific (but obviously kept for backward compatibility reasons).

Signed-off-by: Miquel Raynal <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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