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>