dts: bindings: mtd: add jedec,qspi-nor

Ideally we should be able to just use jedec,spi-nor (to keep Linux
compatibility), but, QSPI controllers live in a limbo in Zephyr. Adding
this binding won't make things worse than they are.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
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