MAINTAINERS: Add Patrick Williams

Patrick is the original author and architect of phosphor-dbus-interfaces.
Patrick is a former maintainer of phosphor-dbus-interfaces.  After a brief
hiatus, he has re-emerged and performed many reviews.  Add Patrick to the
committers ACL.

Change-Id: I8b29d7de140e74dcb3d802cda4f5a7c43efa20ab
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2f5538f..6336b4a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -42,5 +42,6 @@
 START OF MAINTAINERS LIST
 -------------------------
 
+M:  Patrick Williams <patrick@stwcx.xyz> <stwcx!>
 M:  Brad Bishop <bradleyb@fuzziesquirrel.com> <radsquirrel!>
 R:  Deepak Kodihalli <dkodihal@in.ibm.com> <dkodihal!>