rockchip: evb-rk3328: update board maintainer

Update maintainer to Kever Yang for William Zhang is not
work for this board now.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/rockchip/evb_rk3328/MAINTAINERS b/board/rockchip/evb_rk3328/MAINTAINERS
index 9db604f..2ee6e46 100644
--- a/board/rockchip/evb_rk3328/MAINTAINERS
+++ b/board/rockchip/evb_rk3328/MAINTAINERS
@@ -1,5 +1,5 @@
 EVB-RK3328
-M:      William Zhang <william.zhang@rock-chips.com>
+M:      Kever Yang <kever.yang@rock-chips.com>
 S:      Maintained
 F:      board/rockchip/evb_rk3328
 F:      include/configs/evb_rk3328.h