arm64: dts: imx8m{m,p}-verdin: use IT temperatures

Use IT temperature threshold for critical/passive trip point
on Verdin iMX8M Plus and Mini.

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>