Update owners files with new team members

Test: N/A
Change-Id: I48dddae02c9c377f705094d9b58dbe3e2128ac7b

cmds/statsd/OWNERS

-jianjin@google.com
+jeffreyhuang@google.com
 joeo@google.com
 jtnguyen@google.com
 muhammadq@google.com
+ruchirr@google.com
 singhtejinder@google.com
+tsaichristine@google.com
 yaochen@google.com
 yro@google.com

services/core/java/com/android/server/stats/OWNERS

-bookatz@google.com
-cjyu@google.com
-dwchen@google.com
+jeffreyhuang@google.com
 joeo@google.com
+muhammadq@google.com
+ruchirr@google.com
 singhtejinder@google.com
-stlafon@google.com
+tsaichristine@google.com
 yaochen@google.com
-yanglu@google.com
-yro@google.com
\ No newline at end of file
+yro@google.com