Add nt_fw_config support

nt_fw_config replaces plat_info sds strucutre which was passed from
TF-BL31 stage to BL33. TF-BL2 will parse the sds structure and
populate the nt_fw_config dtb file

Signed-off-by: sahil <sahil@arm.com>
Change-Id: I1d977a5ff96b27c1ced453c613eeed9522023a97