owners: grant prohr temporary ownership of EthernetManagerTest

Test: owners file change
Change-Id: I9da5d915edaa17c784994876e6e3664fded90b5b
diff --git a/OWNERS_core_networking_xts b/OWNERS_core_networking_xts
index 59d6575..dc92788 100644
--- a/OWNERS_core_networking_xts
+++ b/OWNERS_core_networking_xts
@@ -4,4 +4,8 @@
 # For cherry-picks of CLs that are already merged in aosp/master.
 jchalard@google.com #{LAST_RESORT_SUGGESTION}
 maze@google.com #{LAST_RESORT_SUGGESTION}
-reminv@google.com #{LAST_RESORT_SUGGESTION}
\ No newline at end of file
+reminv@google.com #{LAST_RESORT_SUGGESTION}
+
+# Only temporary ownership to improve ethernet code quality (b/236280707)
+# TODO: remove by 12/31/2022
+per-file EthernetManagerTest.java = prohr@google.com #{LAST_RESORT_SUGGESTION}
\ No newline at end of file