rockchip: add Kever Yang as co-custodian

This updates MAINTAINERS and git-mailrc to add me as a
co-custodian for rockchip

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Tom Rini <trini@konsulko.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 09f31cd..2902d3e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -239,6 +239,7 @@
 ARM ROCKCHIP
 M:	Simon Glass <sjg@chromium.org>
 M:	Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
+M:	Kever Yang <kever.yang@rock-chips.com>
 S:	Maintained
 T:	git git://git.denx.de/u-boot-rockchip.git
 F:	arch/arm/include/asm/arch-rockchip/