chore: add fdt dependencies to poetry

The FDT python dependency is needed for the script:
`sp_mk_generator.py'.

It is used to obtain information from DT files.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: Id98b93f8ab77d4864dd392fdb70bfd932b78c246
2 files changed