lx9crg: add crg for 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
make.py, top.py: tweaks for lx9 microboard

sdram is 64M on lx9 microboard

lx9 only needs 320k config mem in flash