edify_generator.py: Reconcile symlink wordwrapping w/ cm

Change-Id: Id1c771a1b7beb3176a97b1396b39f90e6656625b
Revert "Allow devices to specify certain ro. props via TARGET_UNIFIED_DEVICE"

This reverts commit 3713520983b785d1eba85a27eb1a588d38aab7d5.