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: I54b06f035034e7564480cd5d4c33c4f62785682d
1 file changed