Update OWNERS for prebuilt_info

Align OWNERS with prebuilt file and info.

Test: Treehugger
Change-Id: I41768ce1131bfa89483a416a74f3da53310a1f05
diff --git a/.prebuilt_info/OWNERS b/.prebuilt_info/OWNERS
new file mode 100644
index 0000000..eb8b89b
--- /dev/null
+++ b/.prebuilt_info/OWNERS
@@ -0,0 +1 @@
+per-file prebuilt_info_packages_CtsShim_*.asciipb = file:/packages/CtsShim/OWNERS