Increase MMAP_RND_BITS to 16 to pass AslrMallocTest

With /proc/sys/vm/mmap_rnd_bits tunable set to 8 bits the detected entropy for
mmap was only 2 bits, and in order to pass the CTS test it has to be at least 8.

Change-Id: Idc5c18e7ae41a35e21f60b19c795d79653fb23be
2 files changed