sim mn10300: Fix igen generation.

sim mn10300: Fix igen generation.

Only pass the top-level instruction decode table (mn10300.igen) to
igen via -i.  The additional files passed previously caused igen to
exit its getopt loop in main and exit silently without generating any
output.  In addition, when am33-2.igen was added, it was not included
from mn10300.igen, so was never used.

sim/mn10300/ChangeLog:

	* Makefile.in: (tmp-igen) Only pass mn10300.igen to igen.
	* mn10300.igen: Include am33-2.igen.