dt-bindings: gpio: pca95xx: drop useless consumer example

Consumer examples in the bindings of resource providers are trivial,
useless and duplication of code.  Remove the example code for consumer

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220316130858.93455-1-krzysztof.kozlowski@canonical.com