mv clockGate from RocketCoreParams to CoreParams

[davidmlw]

Related issue: https://github.com/chipsalliance/rocket-chip/issues/2366

Type of change: other enhancement

Impact: API modification

Development Phase: proposal

Release Notes

clockGate is more a Core Params than a specific Rocket Core Params. With this change, FrontendModule is decouple from RocketCore in Scala code level.

[mwachs5]

The PR description is wrong. This is an API-breaking change. Please update and add release notes

[sequencer]

This should be merged a long time ago.

[linux-foundation-easycla[bot]]

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