ext2_sb_util.sh: split ext2 superblock utils out of common.sh
These complicated funcs are only used by three scripts now. Pull them
out of common.sh and into a new build_library/ fragment for them to load.
BUG=None
TEST=CQ passes
Change-Id: Iab2ea018888538ec5a51738e7524eedd3839cb14
Reviewed-on: https://chromium-review.googlesource.com/1769241
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
5 files changed
