extract_utils: Set `filename_from_src: true` for `CLASS=ETC` targets

Change-Id: I881f6a67d84d8de0a4bef17bf3c9eac049679c38
1 file changed
tree: 60098d08a9e26942f89afcf1f20c6f9e0c80f9d9
  1. templates/
  2. extract_utils.sh
  3. sdat2img.py