Update chromeos OWNERS.

BUG=None
TEST=None

Change-Id: I09696c7c4b0d7f0b76c2fef4de7cee7e7e4c21e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1853850Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Commit-Queue: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705381}

chromeos/OWNERS

@@ -7,11 +7,21 @@ per-file BUILD.gn=*
 # Translation artifacts:
 per-file *.xtb=file://tools/translation/TRANSLATION_OWNERS
 
+# PST
 achuith@chromium.org
 alemate@chromium.org
+jamescook@chromium.org
 oshima@chromium.org
-rkc@chromium.org
-satorux@chromium.org
 stevenjb@chromium.org
+tbarzic@chromium.org
 xiyuan@chromium.org
+
+# CET
+antrim@chromium.org
+emaxx@chromium.org
+rsorokin@chromium.org
+
+# JST
+hashimoto@chromium.org
+
 # COMPONENT: UI>Shell