load selinux property_contexts in /odm and /product

Commit I27dd391fc06a3c78e88a65c7931c84de1699f157  make property_service no longer
load selinux property_contexts by function selinux_android_prop_context_handle,
So we should config /odm and /product property_contexts loading path in
property_service.cpp but not in libselinux.

Test: property_service can load property_contexts in /odm and /product
Change-Id: Ifa94b87180c4867ecbe8dea347ad02bb37958043