Revert "build: edify: use set_metadata for backuptool"

This reverts commit 1116d27b3ceda85aa4095d16a3d9000ebe45db0f.
Revert "Backup tool support"

This reverts commit b77d2142633e0d06b502d75b29a230bb7c02821e.

Conflicts:
	tools/releasetools/ota_from_target_files