Add OWNERS to bitflags

Test: make
Change-Id: I61a877595a4662da78f599e0010f9ad4a353928b
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