Revert "clatd.c: remove unsetenv("ANDROID_DNS_MODE")"

This reverts commit cc94e5f25303bc0ffdc2e327b56564f59f48804f.

Reason for revert: XLAT doesn't work in permissive mode

Bug: 69863844

Change-Id: I62e390b960465048fbbd68e60d0a2c9c7d2c82d3
1 file changed