Revert "Include Treble metadata on Treble enabled devices"

The test rather than the build system needs to check
the files according to the versions of the provided
device (and it does so now).

Fixes: 69864925
Test: clean revert, manual

(revert of cb5b8d2d)

Change-Id: I1922190bfadca74d0652440fe61e29f22a846cf7