dt-bindings: nvmem: convert zii,rave-sp-eeprom.txt to yaml format

dt-bindings: nvmem: convert zii,rave-sp-eeprom.txt to yaml format

Convert device tree binding doc zii,rave-sp-eeprom.txt to yaml format.
Additional changes:
- Add ref to nvme.yaml.
- Add reg property.
- Remove mfd at example.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20241030140315.40562-6-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>