llama : disable pipeline parallelism with nkvo

[slaren]

Pipeline parallelism does not work with no KV offload, but still increases memory usage significantly.

Fixes #7217

[github-actions]

📈 llama.cpp server for bench-server-baseline on Standard_NC4as_T4_v3 for phi-2-q4_0: 545 iterations 🚀

Expand details for performance related PR only

• Concurrent users: 8, duration: 10m
• HTTP request : avg=8622.78ms p(95)=20906.05ms fails=, finish reason: stop=487 truncated=58
• Prompt processing (pp): avg=102.77tk/s p(95)=468.37tk/s
• Token generation (tg): avg=34.32tk/s p(95)=49.21tk/s
• ggml-org/models/phi-2/ggml-model-q4_0.gguf parallel=8 ctx-size=16384 ngl=33 batch-size=2048 ubatch-size=256 pp=1024 pp+tg=2048 branch=sl/disable-pp-nkvo commit=94061d58e747f24e574d4de8cf8c0dcd1b89cc3e

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[mofosyne]

Observation: This PR adds a single extra check for params.offload_kqv to pipeline_parallel switch in this commit.