dt-bindings: iio: gyroscope: bosch,bmg160: correct number of pins

dt-bindings: iio: gyroscope: bosch,bmg160: correct number of pins

[ Upstream commit 767470209cedbe2cc72ba38d77c9f096d2c7694c ]

BMG160 has two interrupt pins to which interrupts can be freely mapped.
Correct the schema to express such case and fix warnings like:

  qcom/msm8916-alcatel-idol347.dtb: gyroscope@68: interrupts: [[97, 1], [98, 1]] is too long

However the basic issue still persists - the interrupts should come in a
defined order.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220805075503.16983-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>