dt-bindings: trivial-devices: Document CPLD on DH electronics boards

The CPLD on DH electronics boards is used to model arbitrary custom
glue logic, however it does have SPI interface. Document the CPLD DT
binding as trivial SPI device.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Peng Fan <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: [email protected]
Cc: NXP Linux Team <[email protected]>
To: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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