Add rand_core/OWNERS

Test: make
Change-Id: I530a149d50e4c5dae37b913503407f13213730a0
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..46fc303
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+include platform/prebuilts/rust:/OWNERS