dt-bindings: iio: Drop Joachim Eastwood

Emails to Joachim Eastwood bounce ("552 5.2.2 The email account that you
tried to reach is over quota and inactive.").

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220809162752.10186-2-krzysztof.kozlowski@linaro.org