Analysis of multiple dex files of a package added

Packages of applications often have multiple dex files associated with
them due to the size. All the dex files can now be analyzed separately.
The documentation related to the scripts has been updated.

Bug: 37754950
Test: export ART_DEX_FILE_ACCESS_TRACKING=true; m -j && m -j
SANITIZE_TARGET=address SANITIZE_LITE=true

Change-Id: I3ce2722941689c3075ccd5a00ba1c7bed23369fc