dt-bindings: hwmon: merge max1619 into trivial devices

Ther Maxim max1619 bindings are trivial, so simply merge it into
trivial-devices.yaml.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210819182544.224121-1-krzysztof.kozlowski@canonical.com


Signed-off-by: Rob Herring <robh@kernel.org>