install: add option to disable overlap detection

!2069 (merged) helps for older versions of the ODROID firmware, the latest versions even have an overlap between binaries. Even with an overlap, the device boots fine.

This MR adds an option to deviceinfo to explicitly ignoring the overlap check. This is a deviceinfo option to avoid that it becomes the default option since this feature is really useful.

I used deviceinfo_sd_embed_check_overlap as key, if that's okay, I will add the following entry to the wiki when this is merged:

Variable	Description	Possible values
deviceinfo_sd_embed_check_overlap	Skip overlap detection when embedding binaries	true or false