nvmem: fixed-cell: Simplify nested if/then schema

There's no reason to have a nested if/then schema as checking for compatible
being present and containing 'mac-base' can all be done in one 'if' schema.

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20240224114516.86365-2-srinivas.kandagatla@linaro.org


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