Add xfest14 PMODs project

This project has a SPI controller connected to each of the ZED boards PMOD
ports JA, JB, JC, JD pin 1-4. Pin 7-10 are connected to the PS7 general purpose
GPIOs, except for JC where it is connected to the PS7 UART controller.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>