tdcdtc: TDC+DTC wishbone peripheral

either generic or spartan6 ioserdes2 based
memtest: shrink memtest space from 64M to 32M

for smaller platforms like the lx9 microboard
software/bios: temporarily disable crcbios()

fails if flash is not working
top.py, lm32_config.v, linker.ld: use static hardcoded rom for bios
remaining changes for lx9 microboard
lx9 impact script for its embedded closed source jtag