ART: Move start of linear mmap_scan out of reserved space
ART: Move start of linear mmap_scan out of reserved space

The first 64KB are protected by SELinux, and we will never be
able to acquire them.

Bug: 15024270
Change-Id: I186a0d5262d396a089d4028a8527a9c56f96dc49

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst