arm64: dts: imx8mq-phanbell: Add gpio-fan/thermal support

It was based on Google Source Code for Coral Edge TPU Mendel release:
https://coral.googlesource.com/linux-imx/



It was tested on Coral Dev Board using this command:
  sudo stress --cpu 4 --timeout 3600

Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>