perf(sysbench): add baseline KPI config

Add baseline KPIs for CPU/Memory/Threads/Mutex averages.
Document thread-key naming used by the gate evaluator.
Enable PASS/FAIL comparisons using delta threshold in run.sh.

Signed-off-by: Srikanth Muppandam <smuppand@qti.qualcomm.com>

Author: smuppand

Runner/suites/Performance/Sysbench_Performance/sysbench_baseline.conf

@@ -0,0 +1,16 @@
+# Sysbench_Performance baseline (key=value)
+# Notes:
+# - time_sec: lower is better
+# - mem_mbps / io_mbps: higher is better
+# - Keep units consistent with parser outputs (MB/sec or MiB/sec). If you have GB/sec, convert to MB/sec.
+# Threads=1 baselines
+cpu_time_sec.t1=3.67
+memory_mem_mbps.t1=3980
+threads_time_sec.t1=3.64
+mutex_time_sec.t1=0.0052
+ 
+# File I/O style KPIs (seq/rnd read/write) — store as MB/sec for gating consistency
+fileio_seqwr_mbps.t1=0.4
+fileio_seqrd_mbps.t1=28.6
+fileio_rndwr_mbps.t1=0.61
+# fileio_rndrd_mbps.t1=__FILL_ME__