dt-bindings: power: maxim,max17042: Fix temp types to signed

The max17042 binding described "maxim,cold-temp" and
"maxim,over-heat-temp" as unsigned values, but in-tree DTS examples
use negative temperatures such as a cold threshold below zero degrees.

Document the temperature properties as signed int32 values so the
schema matches existing DTS data and the driver can use signed helpers.

Assisted-by: Codex:gpt-5-5
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260612215315.1889039-1-robh@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

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