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
diff --git a/pyproject.toml b/pyproject.toml
index 55f3f2a..88c4753 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,3 +25,4 @@
 
 [tool.poetry.group.ci.dependencies]
 click = "^8.1.3"
+fdt = "^0.3.0"