remove on clean:
--config.o
--revision.o
--$(OUTPUT).vhd
--$(OUTPUT).mif
--$(OUTPUT)_disasm.S
--include/config
--include/generated
--tools/dump-info-host.bin

arch/lm32/ram.ld is not removed
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>