clk: Add myself as a maintainer for the clock subsystem

Lukasz has not been very responsive in reviewing clock patches. Add
myself as a maintainer.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Acked-by: Lukasz Majewski <lukma@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6db5354..d30daff 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -667,6 +667,7 @@
 
 CLOCK
 M:	Lukasz Majewski <lukma@denx.de>
+M:	Sean Anderson <seanga2@gmail.com>
 S:	Maintained
 T:	git https://source.denx.de/u-boot/custodians/u-boot-clk.git
 F:	drivers/clk/