Update MAINTAINERS

Add George Liu as a reviewer

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I8b951df52441c12ceec51400c5bba1bfa2bfabb3
diff --git a/MAINTAINERS b/MAINTAINERS
index 84808a1..4a6c18d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -65,3 +65,4 @@
 M:  Deepak Kodihalli <deepak.kodihalli.83@gmail.com> <dkodihal!>
 M:  Tom Joseph <rushtotom@gmail.com> <tomjose!>
 M:  Sampa Misra <sampmisr@in.ibm.com> <sampmisr!>
+R:  George Liu <liuxiwei@inspur.com> <George Liu!>