Header library to remove dependence on runtime/

Add a new header library to remove libdexfile and others' dependence on
runtime (typically runtime/base) includes in libdexfile.  Also a small step
to tease dexlayout and profman away from relying on these as well.

Bug: 22322814
Test: make -j 50 checkbuild
      make -j 50 test-art-host-gtest

Change-Id: I38e2fe399a75f4bc6318c77a71954c00ea73ec2b