The device node pointer is no longer needed in the thermal trip
structure, remove it.

Cc: Alexandre Bailon <abailon@baylibre.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linexp.org>
Reviewed-by: NLukasz Luba <lukasz.luba@arm.com>
Link: https://lore.kernel.org/r/20220722200007.1839356-4-daniel.lezcano@linexp.orgSigned-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>