Make wm to own protolog JSON file

This file is used in protolog mechanism, a log system in WM packages.
WM should take the ownership.

Test: repohook check
fixes: 183642152
Change-Id: I39214156964017241562c07c3fc9a9fb7e80d0cb
diff --git a/data/etc/OWNERS b/data/etc/OWNERS
index 549e074..5aacfdd 100644
--- a/data/etc/OWNERS
+++ b/data/etc/OWNERS
@@ -13,3 +13,4 @@
 [email protected]
 
 per-file preinstalled-packages* = file:/MULTIUSER_OWNERS
+per-file services.core.protolog.json =  file:/services/core/java/com/android/server/wm/OWNERS