The thermal trees were merged into a single one shared with the
maintainer of the subsystem.

Update the location of this group git tree.
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: NZhang Rui <rui.zhang@intel.com>
Link: https://lore.kernel.org/r/20191205121227.19203-1-daniel.lezcano@linaro.org