BundleMap: improved API for user bits

Multiplier: Make MultiplierIO clone-able

Support for versioning in diplomacy (old userbits)

BaseSubsystem: Rename attach method and traits

Trying to resolve warning:

[deprecated] class freechips.rocketchip.rocket.MultiplierIO (1 calls): Unable to automatically infer cloneType on class freechips.rocketchip.rocket.MultiplierIO: constructor has parameters (dataBits, tagBits) that are not both immutable and accessible. Either make all parameters immutable and accessible (vals) so cloneType can be inferred, or define a custom cloneType method.
[warn] There were 1 deprecated function(s) used. These may stop compiling in a future release - you are encouraged to fix these issues.
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- Field unification can be customized and defaults to equality required
- Bulk assignment of BundleMaps now uses defaults for missing fields
- You must now define both a Field and Key class

* Revert "updating README examples with Make changes (#2322)"

This reverts commit 875dcd3e.

* Revert "fixing aspect generation (#2309)"

This reverts commit bbeb2578.

* Revert "separate generator behavior into phases (#2274)"

This reverts commit 9d997506.

Grabbed changes from commit: e81dd8b2

prci: allow configurable ClockGroupDriver drive function

Qualify load and store watchpoints by instruction type

*  assertion for speculative fetch chicken bit

* removed the assertion as it may fail due to race condtion

APBToTL: Qualify address alignment assertion

in particular, handle the common failure scenario where an L1 DCache is added to a design with no cacheable memory region.