fix(TLB): avoid refill when one cycle before need_gpa

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In previous design, refill.valid will be false when need_gpa is true. However, need_gpa is a reg so we add signal need_gpa_wire which will be true one cycle before need_gpa. refill.valid will be false either need_gpa or need_gpa_wire is true.

[XiangShanRobot]

[Generated by IPC robot]
commit: a9771c3

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
a9771c3	1.959	0.450	2.686	1.224	2.832	2.461	2.393	0.919	1.407	1.992	3.435	2.709	2.383	3.261

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
e10e20c	1.959	0.450	2.687	1.228	2.832	2.461	2.393	0.919	1.407	1.992	3.435	2.709	2.383	3.261
9fabe32	1.959	0.450	2.687	1.227	2.832	2.461	2.393	0.919	1.407	1.992	3.435	2.709	2.383	3.261
8c9adf0	1.959	0.450	2.686	1.221	2.832	2.461	2.393	0.919	1.407	1.992	3.435	2.709	2.383	3.264
c92e74d
2e5ebf5	1.959	0.450	2.686	1.238	2.832	2.461	2.393	0.919	1.407	1.992	3.435	2.709	2.383	3.261

[cebarobot]

LGTM