[incremental] checking in apex configs in selinux

Test: builds
Change-Id: Iae7b2f2e6e57418365dabfb271afe03b766d5f29
diff --git a/apex/com.android.incremental-file_contexts b/apex/com.android.incremental-file_contexts
new file mode 100644
index 0000000..f6b21da
--- /dev/null
+++ b/apex/com.android.incremental-file_contexts
@@ -0,0 +1,2 @@
+(/.*)?                u:object_r:system_file:s0
+/lib(64)?(/.*)        u:object_r:system_lib_file:s0