MAINTAINERS: add MSM mailing list

Just adds a mailing list to the MSM maintainer entry.

Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index d5b0b1b..2113c1c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -814,6 +814,7 @@
 M:	David Brown <davidb@codeaurora.org>
 M:	Daniel Walker <dwalker@codeaurora.org>
 M:	Bryan Huntsman <bryanh@codeaurora.org>
+L:	linux-arm-msm@vger.kernel.org
 F:	arch/arm/mach-msm/
 F:	drivers/video/msm/
 F:	drivers/mmc/host/msm_sdcc.c