[AMD][AgentX] dsv4-fp4-mi355x-sglang-agentic-mtp: update conc-list to [48,64] and add hicache dram arm

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: seungrokj

configs/amd-master.yaml

@@ -1695,7 +1695,8 @@ dsv4-fp4-mi355x-sglang-agentic-mtp:
     agentic-coding:
     - dram-utilization: 0.80
       search-space:
-      - { tp: 8, dp-attn: true, kv-offloading: none, conc-list: [4, 8, 16, 32], spec-decoding: mtp }
+      - { tp: 8, dp-attn: true, kv-offloading: none, conc-list: [48, 64], spec-decoding: mtp }
+      - { tp: 8, dp-attn: true, kv-offloading: dram, kv-offload-backend: { name: hicache }, conc-list: [48, 64], spec-decoding: mtp }
 
 # MiniMax-M3 MXFP8 MI355X recipe:
 # https://github.com/vllm-project/recipes/commit/2a3728ed9892debfd767a72a58ebc90b33f186e5