This allows platform code to check if firmware image can be used with
preserving a backup. It may be used e.g. when installing vendor
firmwares that won't restore appended backup archive.
Suggested-by: Luis Araneda <luaraneda@gmail.com>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 1c510fe2980cd787602786e82f44602549d607d4)
78d0d13c86