hwmon: (lm75) Support active-high alert polarity

hwmon: (lm75) Support active-high alert polarity

LM75 devices supported by this driver support configurable active-high
alert polarity. This is already documented in the devicetree description.
Add support for it to the driver.

Follow documentation and defensively enforce active-low if property is
not set. This avoids possible inconsistencies for future devices with
wrong parametrization. No API breakage as all current devices have
their parameters set to active-low.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://lore.kernel.org/r/20260504151020.462342-3-markus.stockhausen@gmx.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>