thermal/drivers/imx8mm: Add hwmon support

Expose thermal sensors as HWMON devices.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20220726122331.323093-1-alexander.stein@ew.tq-group.com


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