libfdt: add missing errors to fdt_strerror()

Some error values were missing from the table which meant that they could
not be translated by fdt_strerror().

Signed-off-by: Benjamin Fair <b-fair@ti.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

libfdt/fdt_strerror.c

@@ -77,6 +77,9 @@ static struct fdt_errtabent fdt_errtable[] = {
 	FDT_ERRTABENT(FDT_ERR_BADVERSION),
 	FDT_ERRTABENT(FDT_ERR_BADSTRUCTURE),
 	FDT_ERRTABENT(FDT_ERR_BADLAYOUT),
+	FDT_ERRTABENT(FDT_ERR_INTERNAL),
+	FDT_ERRTABENT(FDT_ERR_BADNCELLS),
+	FDT_ERRTABENT(FDT_ERR_BADVALUE),
 	FDT_ERRTABENT(FDT_ERR_BADOVERLAY),
 	FDT_ERRTABENT(FDT_ERR_NOPHANDLES),
 };