dt-bindings: iio: honeywell,mprls0025pa: drop ref from pressure properties

The dtschema treats now properties with '-pascal' suffix as standard one
and already defines $ref for them, thus the $ref should be dropped from
the bindings.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20231129111041.26782-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>