Add owners for prebuilt drops.

This will make it easier to semi-automate prebuilt drops. Mainline team
will only ever update the prebuilts from versions coming from the
continuous build.

Bug: 188427719
Test: n/a
Change-Id: I30fc0ff6185f722a388ffc5814c3bb5a977d69a1
diff --git a/OWNERS b/OWNERS
index 8b6675a..b4de908 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1 +1,3 @@
 include platform/packages/modules/common:/OWNERS
+
+include platform/packages/modules/common:/PREBUILTS_MODULE_OWNERS