nvmem: rockchip-otp: set add_legacy_fixed_of_cells config option

The Rockchip OTP describes its layout via devicetree subnodes,
so set the appropriate property.

Fixes: 2cc3b37f ("nvmem: add explicit config option to read old syntax fixed OF cells")
Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20240705074852.423202-5-srinivas.kandagatla@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>