fix(tftf): resolve build issues

This patch resolves build issues introduced by commit [1].

[1]: https://review.trustedfirmware.org/c/TF-A/tf-a-tests/+/18037



Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I758642eda440383cbd3ddf9027a864616e0254e4