Move libdexfile out of runtime

Move the files out of runtime, leaving unfortunate dependences still
there on runtime/base (for the moment).  Also separates the build logic
into two Android.bp files.

Bug: 22322814
Test: make -j 50 test-art-host
Change-Id: Ib0a1cda833b29ecfa4c8c50f23fab89ba666f491
58 files changed