Convert the Maxim MAX732x family of GPIO expanders bindings to device
tree schema by merging it with existing PCA95xx schema.  These are quite
similar so merging reduces duplication.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200916155715.21009-3-krzk@kernel.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>