sf: make calculatiom of address bytes completely configurable

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
sf: add support for 4-byte addressing

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
sf: add support for EN25QH256

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
sf: fix sector layout of S25FL256S_256K and S25FL512S_256K

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>