CSR: remove useless sdsid custom-CSR

[cebarobot]

Custom-CSR sdsid is a legacy from labeled XiangShan, which is no longer in use. Remove this Custom-CSR.

This patch fixes OpenXiangShan/NEMU#329

[XiangShanRobot]

[Generated by IPC robot]
commit: 40e7742

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
40e7742	1.841	0.450	2.103	1.190	2.478	2.597	2.331	0.960	1.377	1.391	3.126	2.639	2.452	2.959

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
0c70648	1.854	0.450	2.103	1.190	2.468	2.593	2.330	0.960	1.377	1.427	3.123	2.639	2.451	2.960
b628978	1.854	0.450	2.103	1.190	2.468	2.593	2.329	0.960	1.377	1.427	3.123	2.639	2.451	2.960
5e237ba		0.450	2.103				2.328		1.377			2.639
363530d	1.841			1.190	2.478	2.597		0.961		1.391	3.126		2.452	2.959
a72b131
05d833a	1.854	0.450	2.103	1.190	2.468	2.593	2.330	0.961	1.377	1.427	3.123	2.639	2.451	2.960
9cb05b4		0.450	2.103				2.330		1.377			2.639
4daa5bf		0.450	2.103	1.190	2.468	2.593	2.329	0.962	1.377	1.427	3.123	2.639		2.960
1e018fb	1.854	0.450	2.103	1.190	2.468	2.593	2.330	0.962	1.377	1.427	3.123	2.639	2.451	2.960
3c71816	1.854	0.450	2.103	1.190	2.468	2.593	2.330	0.962	1.377	1.427	3.123	2.639	2.451	2.960