MAINTAINERS: update entry for drivers/power/avs

Some more AVS-related drivers are arriving.  Update MAINTAINERS to
reflect that myself and Nishanth will keep an eye on the new ones as
well.

Signed-off-by: Kevin Hilman <khilman@linaro.org>

MAINTAINERS

@@ -8348,11 +8348,11 @@ S:	Maintained
 F:	Documentation/security/Smack.txt
 F:	security/smack/
 
-SMARTREFLEX DRIVERS FOR ADAPTIVE VOLTAGE SCALING (AVS)
+DRIVERS FOR ADAPTIVE VOLTAGE SCALING (AVS)
 M:	Kevin Hilman <khilman@kernel.org>
 M:	Nishanth Menon <nm@ti.com>
 S:	Maintained
-F:	drivers/power/avs/smartreflex.c
+F:	drivers/power/avs/
 F:	include/linux/power/smartreflex.h
 L:	linux-pm@vger.kernel.org