When a callback does not exist, the Flashdev API should return error
where possible instead of success. When the API returns success for
missing callbacks, the Flashdev API client code may end up using
uninitialized variables as if they were filled by the API.
Closes#5391
This extends the flashdev API to support the additional calls required
by NAND device backends. This also adds region-relative IOCTLs to
prevent reimplementation of offset logic in top-end flashdev/filesystem
adapters.
This adds an API call allowing for unregistration to include destruction
of private data that is not managed by the flashdev framework. This also
updates the existing consumers of flashdev to use the new private data
destructor callback.
Previously, the erase ioctl call would ignore flash regions and erase at
the absolute address passed in. This adds a check for if the region is
set and adds the region offset accordingly.
