MAINTAINERS: Fix 'F' entry for the power supply class

For some reason the maintainers file only specifies power
supply core files.

We're surely interested in individual drivers as well, so fix
the entry.

Reported-by: Grazvydas Ignotas <notasas@gmail.com>
Reported-by: NeilBrown <neilb@suse.de>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index bb76fc4..3766f6a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5290,7 +5290,7 @@
 T:	git git://git.infradead.org/battery-2.6.git
 S:	Maintained
 F:	include/linux/power_supply.h
-F:	drivers/power/power_supply*
+F:	drivers/power/
 
 PNP SUPPORT
 M:	Adam Belay <abelay@mit.edu>