Allow cppreopts to work with selinux

(cherry picked from commit d3edd6b577c1e40834af69420bd77b60c359ef8e)

Bug: 29278988
Change-Id: I199572377a6b5c33116c718a545159ddcf50df30
diff --git a/property_contexts b/property_contexts
index 9190831..2ae1bb0 100644
--- a/property_contexts
+++ b/property_contexts
@@ -21,6 +21,7 @@
 hw.                     u:object_r:system_prop:s0
 ro.hw.                  u:object_r:system_prop:s0
 sys.                    u:object_r:system_prop:s0
+sys.cppreopt            u:object_r:cppreopt_prop:s0
 sys.powerctl            u:object_r:powerctl_prop:s0
 sys.usb.ffs.            u:object_r:ffs_prop:s0
 service.                u:object_r:system_prop:s0