MAINTAINERS: BMIPS: Add internal Broadcom mailing list

There is a patchwork instance behind bcm-kernel-feedback-list that is
helpful to track submissions, add this list for the MIPS BMIPS entry.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@linux-mips.org

MAINTAINERS

@@ -3121,6 +3121,7 @@ F:	drivers/cpufreq/bmips-cpufreq.c
 BROADCOM BMIPS MIPS ARCHITECTURE
 M:	Kevin Cernekee <cernekee@gmail.com>
 M:	Florian Fainelli <f.fainelli@gmail.com>
+L:	bcm-kernel-feedback-list@broadcom.com
 L:	linux-mips@vger.kernel.org
 T:	git git://github.com/broadcom/stblinux.git
 S:	Maintained