Add Support for Xilinx KCU116 (#322)

* initial kcu116 support

* add kintex ultrascale plus family to xilinx.cpp

* add docs

* combine xcku and xcvu check

* rebuild bitstream for -1 speedgrade

src/xilinx.hpp

@@ -161,6 +161,7 @@ class Xilinx: public Device, SPIInterface {
 			ARTIX_FAMILY,
 			KINTEX_FAMILY,
 			KINTEXUS_FAMILY,
+			KINTEXUSP_FAMILY,
 			ZYNQ_FAMILY,
 			ZYNQMP_FAMILY,
 			XCF_FAMILY,