dt-bindings: leds: Document pull-up supply for interrupt and I2C

Since the interrupt and I2C lines of AW2013 operate in open drain low
active mode a pull-up supply is needed for correct operation.
Unfortunately there is no ideal place to describe it in the DT: The
pull-up needed for the I2C lines could be described on the I2C bus.
However, the pull-up needed for the interrupt line belongs neither
directly to the interrupt controller nor to AW2013. Since the AW2013
driver will be typically in control of the power management and
interrupt masking it makes more sense to describe it inside the AW2013
device tree node.

Add it to the AW2013 DT schema together with a comment that makes it
clear what exactly it represents.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Nikita Travkin <nikita@trvn.ru>
Link: https://lore.kernel.org/r/20230815-aw2013-vio-v3-2-2505296b0856@gerhold.net


Signed-off-by: Lee Jones <lee@kernel.org>