Add ro.sys.safemode property.

am: 3e8d1bf8

* commit '3e8d1bf8':
  Add ro.sys.safemode property.

Change-Id: Ib8c29d092e732a9d519c9079642cefb6b1e9c0f0

property_contexts

@@ -45,6 +45,7 @@ persist.log.tag         u:object_r:logd_prop:s0
 persist.mmc.            u:object_r:mmc_prop:s0
 persist.sys.            u:object_r:system_prop:s0
 persist.sys.safemode    u:object_r:safemode_prop:s0
+ro.sys.safemode         u:object_r:safemode_prop:s0
 persist.sys.audit_safemode      u:object_r:safemode_prop:s0
 persist.service.        u:object_r:system_prop:s0
 persist.service.bdroid. u:object_r:bluetooth_prop:s0