[Arch] Added Artix-7-like Devices on the Xilinx 7 Series Capture

For testing Analytical Placement, we currently need fixed-sized devices.
To get the 7-Series architecture capture through the AP flow, I selected
fixed device sizes that matched the Artix-7 device family in resource
utilization.

The fixed layouts were obtained by performing the following process:

1) The device was auto-sized to the FPGA with the closest number of CLB
   slices to the target device.

2) Extra RAMs, DSPs, and IOs were dropped out evenly across the device.

The RAMs and DSPs usually needed to be dropped out, and their numbers
were often cut in half relative to their auto-sized resource counts.

The IOs majorly needed to be dropped out. The number of IOs in the
auto-sized devices were around 10x their Artix-7 equivalent (with
matching CLB resources).

These devices likely do not model the layout of the Artix-7 devices
faithfully; however, my goal was to simulate the resource utilization of
the Artix-7 device family on our Xilinx 7-Series capture.

Author: AlexandreSinger