of: fdt: Remove unused struct fdt_scan_status

After commit bba04d96("of/fdt: remove unused of_scan_flat_dt_by_path"), no
one use struct fdt_scan_status, so remove it.

Signed-off-by: Yuan Can <yuancan@huawei.com>
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
Link: https://lore.kernel.org/r/20220927133739.98493-1-yuancan@huawei.com


Signed-off-by: Rob Herring <robh@kernel.org>