Rework the way we set the default settings to avoid missalignment between
FIP_CONFIG and both FIP_BL32_CONF and FIP_DEVICETREE on SDK side.
Avoid also var expansion issue since Kirkstone update as the python
anonymous function schedule has changed. Now var expansion is run for all
available configs.
Signed-off-by: Romuald JEANNE <romuald.jeanne@st.com>
Change-Id: I0f86bc724c458f56cb48fb1be97bb608b2ac740b