Revert "hammerhead: switch back to dlmalloc"

This reverts commit 79906085f6fe832b92fe9095fd251e1db26ede55.

Didn't do anything for:

b/18069309 N5 running L can't run as many apps simultaneously as running K

Change-Id: I9c5ed4257f2162757c6e147e396af882ecef913c
1 file changed