thermal/drivers/generic-adc: Simplify probe() with local dev variable

Simplify the probe() function by using local 'dev' instead of
&pdev->dev.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240709-thermal-probe-v1-11-241644e2b6e0@linaro.org


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>