[fpga-miniconf] litevideo VGA on arty WIP

[Hasjim Williams]

HI everyone,

I managed to get Vivado 2016.4 to output VGA with the Pmod-VGA
example from:
https://reference.digilentinc.com/reference/pmod/pmodvga/start

https://github.com/Digilent/Arty-Pmod-VGA
https://reference.digilentinc.com/learn/programmable-logic/tutorials/arty-pmod-vga-demo/start
I made some changes to litex-buildenv with the help of Florent, and made
a pull request on github:
https://github.com/timvideos/litex-buildenv/pull/20

This is still WIP and output doesn't work on Pmod-VGA yet in the
hdmi2usb firmware.
I don't think it's clocking out the pixel clock, hsync and/or vsync
correctly yet.
Hasjim 'futaris' Williams
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