Add antrim@ and rsorokin@ to ash/login owners

Change-Id: I178594815e130a335ee2f23d420556cd7e1a14ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080426Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Thomas Tellier <tellier@google.com>
Cr-Commit-Position: refs/heads/master@{#745464}

ash/login/OWNERS

+# (in PST)
 tbarzic@chromium.org
 xiyuan@chromium.org
 
+# (in CET)
+antrim@chromium.org
+rsorokin@chromium.org
+
 # For login-screen issues use component UI>Shell>StartScreen
 #
 # COMPONENT: UI>Shell>LockScreen