hw: added 2x VLSU bandwidth and TROOP optimizations for Spatz

[Navaneeth-KunhiPurayil]

To add feature to support for double VLSU bandwidth to L1 scratchpad in Spatz cluster to accelerate memory-intensive workloads. This configuration can be enabled by setting double_bw parameter in spatz configuration file and doubling the number of spatz_nports w.r.t number of functional units (assuming 64b granularity).

Added

1. spatz_doublebw_vlsu.sv - To implement the load-store functionality to generate spatz_nports parallel requests across 2 interfaces and commit each interface separately back to the VRF, synchronizing between them only at instruction completion.
2. All functionality related to this feature in the spatz.sv, spatz_controller.sv, spatz_vrf.sv is enclosed with the pragma DOUBLE_BW.
3. Added hardware address scrambling support in spatz_tcdm_interconnect.sv to misalign VLSU requests to avoid conflicts at the L1 for varying LMUL configurations.
4. Added unrolled version of dp-fdotp and dp-faxpy for higher performance configurable using a -DUNROLL cmake option.
5. spatz_cluster.doublebw.dram.hjson - Configuration with double bw support to the default spatz core configuration which is also added in the CI tests.

[DiyouS]

In general looks quite good to me. One question I have: do you think we should add a CI test for double-bw configuration?

[Navaneeth-KunhiPurayil]

I have also added the double VLSU bandwidth configuration to CI tests