MAINTAINERS: add Stephen Boyd as clk co-maintainer

Signed-off-by: Michael Turquette <mturquette@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index ea4d005..46d652f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2491,6 +2491,7 @@
 
 COMMON CLK FRAMEWORK
 M:	Mike Turquette <mturquette@linaro.org>
+M:	Stephen Boyd <sboyd@codeaurora.org>
 L:	linux-kernel@vger.kernel.org
 T:	git git://git.linaro.org/people/mturquette/linux.git
 S:	Maintained