feat(XSNoCDiffTop): wrap XSNoCTop with Difftest Interface

[klin02]

build(Makefile): support PLDM_ARGS for make verilog

For PLDM_ARGS, we make it consistent with DEBUG_ARGS by default. User can set PLDM_ARGS in command line to extend it.
Examples as follows:

1. By set PLDM_ARGS="--fpga-platform" and PLDM=1, we will disable
   XSLog(including PerfCounters) for both verilog and sim-verilog.
2. By set PLDM_ARGS="--diffest-config ESBINP" and PLDM=1, we can
   accelerate Difftest in Palladium through some optimization feature.

---

feat(XSNoCDiffTop): wrap XSNoCTop with Difftest Interface

To apply Difftest framework for CHI NoC, we wrapper lazy XSNoCTop inside XSNoCDiffTop when difftest enabled, and expose necessary soc/core/difftest IOs.

Currently we use two-step flow for CHI-NoC-XS as follow:
Step1. Generate single-core XSNoCDiffTop with JsonProfile, which support generate another DifftestEndpoint seperately.
Step2. Generate n-core Difftest according to JsonProfile
Step3. Connect XS and Difftest manually or by some scripts.

As XSNoCDiffTop is only part of Difftest, we collect PerfCounters for each DiffTop, need control signals passed from Outer module. And to avoid potential connection problem, we add checker module and CI test.

An example usage:
make verilog PLDM=1 PLDM_ARGS=“--difftest-config H” CONFIG=XSNoCTopConfig

[klin02]

May we can replace RELEASE_EXTRA_ARGS with better name. And add --enable-difftest to that by default

[XiangShanRobot]

[Generated by IPC robot]
commit: c572ac6

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
c572ac6	1.811	0.442	2.640	1.211	2.154	2.143	2.363	0.952	1.402	1.908	3.110	2.555	2.278	3.311

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
4863970				1.211	2.154	2.143		0.952		1.908	3.110			3.311
0a84afd
d33d62c
c559bb1

[klin02]

May we can replace RELEASE_EXTRA_ARGS with better name. And add --enable-difftest to that by default

A better argName for "RELEASE_EXTRA_ARGS" is welcomed. It's just a demo name.
Maybe NOC_DIFF_ARGS ?

BTW, if Perf Counter is fully tested in Palladium and bring no speed loss. We may remove PLDM_ARGS latter to make it aligned with SIM_ARGS. Note current PLDM=1 only works for make sim-verilog.

[klin02]

Mess of commit history. I will rebase it later.

[XiangShanRobot]

[Generated by IPC robot]
commit: d5ed5b5

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
d5ed5b5	1.814	0.442	2.639	1.231	2.152	2.141	2.360	0.933	1.403	1.985	3.107	2.558	2.267	3.308

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
2f0227e				1.231				0.933						3.308
ca892e7		0.442	2.639	1.231			2.360	0.933	1.406			2.558		3.308
51aa1b6	1.814	0.442	2.639	1.231	2.152	2.141	2.360	0.933	1.403	1.985	3.107	2.558	2.267	3.308
ae39693	1.814	0.442	2.639	1.231	2.152	2.141	2.361	0.933	1.403	1.985	3.107	2.558	2.267	3.308