MAINTAINERS: add wak@ as new maintainer

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I43d2dcd2e527ad9d3cf0d9f122c42be8996e5b16
diff --git a/MAINTAINERS b/MAINTAINERS
index b918af2..e4bb01f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -43,3 +43,4 @@
 -------------------------
 
 M:  Patrick Venture <venture@google.com> <venture!>
+M:  William Kennington <wak@google.com> <wak-work!>