Allow dlopen()ing libraries from the netd APEX on pasan build

This is a workaround to allow us to use libnetd_resolv.so from
the resolver APEX before b/120661824 is fixed.

We cannot put the APEX into the search path due to b/120661824,
but we can put it into the permitted path,

Bug: b/122073006
Test: builds, boots
Test: system/netd/tests/runtests.sh
Change-Id: If6f13ba9dc249d019b820a7c37cf6d4cdd8d0a7d