Add owners file for all bp files in apex subdir

This is a frequent area of build refactoring.

Test: No
Change-Id: I7582fc3bfa00d2bff74012d6aa31a4b236b916f8
diff --git a/apex/OWNERS b/apex/OWNERS
new file mode 100644
index 0000000..9760013
--- /dev/null
+++ b/apex/OWNERS
@@ -0,0 +1,7 @@
+# Shared module build rule owners
+per-file *.bp=hansson@google.com
+per-file *.bp=jiyong@google.com
+
+# This file, and all other OWNERS files
+per-file OWNERS=dariofreni@google.com
+per-file OWNERS=hansson@google.com