OWNERS: Add George Liu as a reviewer

I have been actively contributing to openbmc/phosphor-host-ipmid
for quite some time now. Attached is a summary of my contributions
to the repository [1].

[1]: https://github.com/openbmc/phosphor-host-ipmid/commits?author=lxwinspur

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: If65f0245b5473ced311821cde58f1d60474eadea
diff --git a/OWNERS b/OWNERS
index 5d16ddd..1a5d8d5 100644
--- a/OWNERS
+++ b/OWNERS
@@ -38,6 +38,7 @@
 reviewers:
 - anoo@us.ibm.com
 - deepak.kodihalli.83@gmail.com
+- liuxiwei@ieisystem.com
 - ratagupt@linux.vnet.ibm.com
 
 matchers:
@@ -49,6 +50,9 @@
 - name: Deepak Kodihalli
   email: deepak.kodihalli.83@gmail.com
   discord: dkodihal
+- name: George Liu
+  email: liuxiwei@ieisystem.com
+  discord: George Liu
 - name: Ratan Gupta
   email: ratagupt@linux.vnet.ibm.com
   discord: rgupta