fix(fiptool): avoid packing the zero size images in the FIP

Updated the fiptool to avoid packing the zero size images in
the FIP.
Also, updated the commitlint-json file to cover the fiptool
changes under a separate scope.

Change-Id: Id7ac3dcff0c7318546e49308d0f17b6cbd5eb24b
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
2 files changed