Don't enable memory-mapped coverage for child zygote.

Child zygote processes should not enable memory-mapped coverage until
they are specialized to prevent file descriptors being held open
unnecessarily across forks.

Test: atest AdServiceCoreUnitTest
Bug: 234430476
Change-Id: I969750b548edfeb2432b0abd78eaab7808fcb1f2
1 file changed