Soong OWNERS: add more folks and categorize by timezones.

Test: N/A
Change-Id: Ifc16654d1a295fe341b982319101be9c8c170113
diff --git a/OWNERS b/OWNERS
index bbfd011..f15bd32 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,17 +1,22 @@
 # This file is included by several other projects as the list of people
 # approving build related projects.
 
+# AMER
 ahumesky@google.com
 asmundak@google.com
 ccross@android.com
 cparsons@google.com
 dwillemsen@google.com
 eakammer@google.com
-jingwen@google.com
 joeo@google.com
-lberki@google.com
+spandandas@google.com
+yuntaoxu@google.com
+
+# APAC
+jingwen@google.com
 ruperts@google.com
 
-# To expedite LON reviews
+# EMEA
 hansson@google.com
+lberki@google.com
 paulduffin@google.com