Thank you Felix for the details.
Intel FIT Tool does not provide other options except enabling the GbE region and option to add the binary file for Lan controller 0 and 1 region.
I wanted to enable the region to properly initialize the pcie region as well to get the correct details for the Intel Lan controller. Currently i could see only the default device id which is not supported by Intel Lan kernel driver.
Regards,
Balaji