MAINTAINERS: update thermal entry by adding file cpu_cooling.h

Add cpu_cooling.h to thermal entry in MAINTAINERS.

Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
Acked-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index beb8330..743d540 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7905,6 +7905,7 @@
 S:      Supported
 F:      drivers/thermal/
 F:      include/linux/thermal.h
+F:      include/linux/cpu_cooling.h
 
 THINGM BLINK(1) USB RGB LED DRIVER
 M:	Vivien Didelot <vivien.didelot@savoirfairelinux.com>