drivers: nvmem: add API for nvmem controllers

Add a nvmem API to access nvmem cells using device-tree description. This
API allows to register nvmeme provider and obtain nvmem cells for consumer.
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drivers: nvmem: add API for nvmem controllers

Add a nvmem API to access nvmem cells using device-tree description. This
API allows to register nvmeme provider and obtain nvmem cells for consumer.
Much like other subsystem, this one relies on the generic dt_driver
mechanism.

Signed-off-by: Clément Léger <clement.leger@bootlin.com>
Signed-off-by: Thomas Perrot <thomas.perrot@bootlin.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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