MAINTAINERS: Add patchwork entry for Thermal subsystem

Update the Thermal subsystem MAINTAINERS entry by adding
its patchwork link.
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>

MAINTAINERS

@@ -7901,6 +7901,7 @@ M:      Zhang Rui <rui.zhang@intel.com>
 M:      Eduardo Valentin <eduardo.valentin@ti.com>
 L:      linux-pm@vger.kernel.org
 T:      git git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux.git
+Q:      https://patchwork.kernel.org/project/linux-pm/list/
 S:      Supported
 F:      drivers/thermal/
 F:      include/linux/thermal.h