Add transmute rule between non-hybrid app and RW path

Add transmute rule between non-hybrid app and RW path

After app process label refactoring there were no more
rule for transmute between label of app process and
label of path RW for non-hybrid (because labels were
the same). This introduced problem with transmute
inheritance : main app directory had transmute,
but it wasn't inherited by subdirectories.

This commit brings back rule between app process label
and path RW label even when both labels are the same.
Also proper policy migration is created, so already
installed apps have this rule also generated.

Change-Id: I98a34a29b2c2490d1dcafd43a117b509a763d72e