mfd: dt-bindings: google,cros-ec: Fix indentation in example

Correct level of indentation in the example.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220124082347.32747-4-krzysztof.kozlowski@canonical.com