MAINTAINERS: update thermal CPU cooling section

Update maintainers responsible for CPU cooling on Arm side.
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Javi Merino <javi.merino@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210217115908.22547-1-lukasz.luba@arm.com

MAINTAINERS

@@ -17771,7 +17771,7 @@ THERMAL/CPU_COOLING
 M:	Amit Daniel Kachhap <amit.kachhap@gmail.com>
 M:	Daniel Lezcano <daniel.lezcano@linaro.org>
 M:	Viresh Kumar <viresh.kumar@linaro.org>
-M:	Javi Merino <javi.merino@kernel.org>
+R:	Lukasz Luba <lukasz.luba@arm.com>
 L:	linux-pm@vger.kernel.org
 S:	Supported
 F:	Documentation/driver-api/thermal/cpu-cooling-api.rst