I eventually opened a ticket with Microsoft to get this fixed.  I had to import and re-generate the boot files completely with the NIC drivers.  I also had to add the following steps to my Task Sequence: In the Preinstall phase: Format and Partition Disk - Legacy  ---Set Disk Type to Standard (MBR)  ---Options Tab - Task sequence variable IsUEFI equals False Format and Partition Disk - UEFI  ---Set Disk Type to GPT  ---Options Tab - Task Sequence variable IsUEFI equals True I was able to build after doing all of this.
I am attempting to build an M620 using MDT 2012.  I have downloaded the BCM57810 NIC x64 drivers as well as the H310 mini storage controller and imported it into my workbench. Can anyone tell me how to get past this problem?
MDT 2012 | 12G | M620