Add Zhikui Ren as maintainer

Signed-off-by: Zhikui Ren <zhikui.ren@intel.com>
Change-Id: Ia49fe6f69ee48c824998b98530a69e6e19e7189c
diff --git a/MAINTAINERS b/MAINTAINERS
index a0c5b70..24f102c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -45,4 +45,5 @@
 M:  James Feist <james.feist@linux.intel.com> <jfei!>
 M:  Vernon Mauery <vernon.mauery@linux.intel.com> <vmauery!>
 M:  Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> <yoojae!>
+M:  Zhikui Ren <zhikui.ren@intel.com> <zhikui!>
 R:  Ed Tanous <ed@tanous.net> <edtanous!>