dt-bindings: nvmem: Convert rockchip-efuse bindings to yaml

Convert the existing rockchip-efuse binding to json-schema. No changes
were done to the binding except for small changes in the documentation
strings.

This deletes the rockchip-efuse.txt binding and replaces it with
rockchip-efuse.yaml.

Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@collabora.com>
Signed-off-by: Rob Herring <robh@kernel.org>