regulator: Restore L: linux-kernel@vger.kernel.org entry

As with commit 981c3a4ff85 (MAINTAINERS: Restore "L:
linux-kernel@vger.kernel.org" entries) restore the mailing list entry
for the regulator framework in order to assist users in finding the list
if they read the file instead of using get_maintainers.pl.

Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index aefa948..c42f647 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9827,6 +9827,7 @@
 VOLTAGE AND CURRENT REGULATOR FRAMEWORK
 M:	Liam Girdwood <lgirdwood@gmail.com>
 M:	Mark Brown <broonie@kernel.org>
+L:	linux-kernel@vger.kernel.org
 W:	http://opensource.wolfsonmicro.com/node/15
 W:	http://www.slimlogic.co.uk/?p=48
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git