Add kelvin_core and fastvdma_core targets
These two targets are intended to be built via m4ci in Louhi and then
passed up to the airgapped bitstream build
Bypass-Presubmit-Reason: manually tested
Change-Id: Iadb6ef21e7d15d7f7952dc932a24d6a8272814c9
This is the project containing all the top-level build targets of all the projects within the GoB to set up the environment and build the e2e artifacts.