init: Add new props triggers

Both Omni and CM split props loading into load_system_props_action and
load_persist_props_actions in Android 6.0 instead of all_props action.
Add these triggers. Unrecognized triggers do not cause failures in init
for versions of Android which do not have these.

Change-Id: I9682690ff7d378dc0d5e1598754f7a29600c1c2d