Update Makefile

[ENJOU1224]

MFC默认改为1以使用chisel来替代chisel3来生成verilog代码

[XiangShanRobot]

[Generated by IPC robot]
commit: 5a53bc7

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
5a53bc7	1.862	0.450	2.092	1.172	2.178	2.174	2.337	0.966	1.370	1.253	2.738	2.556	2.283	2.930

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
7390003	1.862	0.450	2.092	1.174	2.178	2.174	2.337	0.966	1.370	1.253	2.738	2.561	2.283	2.930
40d3f1b	1.862	0.450	2.092	1.182	2.178	2.174	2.334	0.966	1.370	1.253	2.738	2.566	2.283	2.930
73c515a	1.862	0.450	2.096	1.174	2.178	2.174	2.335	0.966	1.374	1.253	2.738	2.552	2.283	2.930
0c22420	1.862	0.450	2.092	1.174	2.178	2.174	2.333	0.966	1.370	1.253	2.738	2.556	2.283	2.930
afd7818	1.862	0.450	2.090	1.184	2.178	2.174	2.335	0.966	1.370	1.253	2.738	2.554	2.283	2.930
0785388	1.862	0.450	2.090	1.175	2.178	2.174	2.332	0.966	1.392	1.253	2.738	2.556	2.283	2.930
78c76c7	1.862	0.450	2.097	1.174	2.178	2.174	2.335	0.966	1.370	1.253	2.738	2.549	2.283	2.930
7bc477b	1.862	0.450	2.092	1.174	2.178	2.174	2.335	0.966	1.405	1.253	2.738	2.557	2.283	2.930
aee6a6d	1.862	0.450	2.092	1.173	2.178	2.174	2.335	0.966	1.370	1.253	2.738	2.560	2.283	2.930
19fbeaf	1.874	0.449	2.099	1.159	2.162	2.182	2.332	0.956	1.408	0.836	2.736	2.573	2.275	2.894