Updated to the newest vivado and required removing the paramized enum. Also includes Jacob's SD card updates and new boot process.

Created by: rosethompson

• Added wfi and interrupt to tracer.
• Got xcelium running wally, but it fails to actually preload the memories.
• Somehow the Arty A7 device tree was missing.
• Fixed the icache and dcache overlogging issue.
• Fixed bug with performance counters not tracking the correct number of requested icache and dcache memory operations.
• Updated the FPGA zero stage bootloader.
• Updated arty a7 fpga top.
• Added artya7 device tree.
• Added new submodule for digilent fpga boards.
• Wow. The newest version of Vivado does not like the enums as parameters. The solution is simple. I changed the type to logic [31:0] and defined macros for the branch predictor types as 32 bit integers.