fix(BPU): adjust fallThroughErr signal usage strategy

[my-mayfly]

1.restore the generation mechanism of BPU hit and fallThruError signals.
2.the hit signal and fallThroughError signal are associated with other modules.

[XiangShanRobot]

[Generated by IPC robot]
commit: 42164ad

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
42164ad	1.934	0.451	2.704	1.194	2.812	2.465	2.400	0.918	1.401	1.609	3.419	2.753	2.429	3.275

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
26175c3		0.451	2.704	1.194	2.812	2.465	2.400	0.913	1.401	1.626	3.415	2.758	2.429	3.271
d6b32cb	1.934	0.451	2.704	1.194	2.812	2.465	2.400	0.918	1.401	1.609	3.419	2.753	2.429	3.275
478bf92		0.451	2.704				2.400	0.918	1.401			2.753
ad415ae	1.934	0.450	2.695	1.192	2.812	2.465	2.399	0.918	1.397	1.609	3.424	2.761	2.429	3.275
5860cb7	1.934	0.450	2.695	1.192	2.812	2.465	2.399	0.918	1.397	1.609	3.424	2.761	2.429	3.275
45def85	1.934	0.450	2.695	1.192	2.812	2.465	2.399	0.918	1.397	1.609	3.424	2.761	2.429	3.275
a4c587d	1.934	0.450	2.695	1.192	2.812	2.465	2.399	0.918	1.397	1.609	3.424	2.761	2.429	3.275
cb36ac0	1.934	0.450	2.695	1.192	2.812	2.465	2.399	0.918	1.397	1.609	3.424	2.761	2.429	3.275
9402431	1.934	0.450	2.695	1.192	2.812	2.465	2.399	0.918	1.397	1.609	3.424	2.761	2.429	3.275

[eastonman]

LGTM