MAINTAINERS: Remove Kevin as maintainer of BMIPS generic platforms

The last time Kevin did a review was sometime around 2014,
since then, he has not been active for the BMIPS generic platform
changes.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
[paulburton@kernel.org:
  Drop the non-technical commit message content; Kevin's absence from
  the role is ample reasoning for this change.]
Signed-off-by: Paul Burton <paulburton@kernel.org>

MAINTAINERS

@@ -3260,7 +3260,6 @@ S:	Maintained
 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