cmd/spl.c: Include <libfdt.h> for fdt_totalsize

In order to be able to reliably use fdt_totalsize, we must have
<libfdt.h> included.

Fixes: 767cb74a0028 ("cmd: spl: provide address and size of prepared FDT ...")
Signed-off-by: Tom Rini <trini@konsulko.com>
1 file changed