Integrate latency injection queue

[abejgonzalez]

See title. Useful for downstream projects using Chipyard.

Related PRs / Issues:

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

• RTL change
• Software change (RISC-V software)
• Build system change
• Other

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[jerryz123]

Can we just add this to rocketchip/util?

There's general interest in such having such functionality. chipsalliance/rocket-chip#3512

[joonho3020]

i agree with jerry
adding this as a separate submodule seems like a overkill

[abejgonzalez]

I'm more than happy to put this in Rocket Chip. Let's do that instead.