MAINTAINERS: remove section INTEL MENLOW THERMAL DRIVER

Commit 2b6a7409 ("thermal: intel: menlow: Get rid of this driver")
removes the driver drivers/thermal/intel/intel_menlow.c, but misses to
remove its reference in MAINTAINERS.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

Remove the INTEL MENLOW THERMAL DRIVER section in MAINTAINERS.

Fixes: 2b6a7409

 ("thermal: intel: menlow: Get rid of this driver")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>