perf vendor events intel: Add basic metrics for Elkhartlake

Add JSON metrics for Elkhartlake to perf.
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210802053440.21035-3-yao.jin@linux.intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/pmu-events/arch/x86/elkhartlake/ehl-metrics.json

+[
+    {
+        "MetricExpr": "INST_RETIRED.ANY / cycles",
+        "BriefDescription": "Instructions Per Cycle (per Logical Processor)",
+        "MetricName": "IPC"
+    },
+    {
+        "MetricExpr": "1 / IPC",
+        "BriefDescription": "Cycles Per Instruction (per Logical Processor)",
+        "MetricName": "CPI"
+    },
+    {
+        "MetricExpr": "cycles",
+        "BriefDescription": "Per-Logical Processor actual clocks when the Logical Processor is active.",
+        "MetricName": "CLKS"
+    },
+    {
+        "MetricExpr": "INST_RETIRED.ANY / BR_MISP_RETIRED.ALL_BRANCHES",
+        "BriefDescription": "Number of Instructions per non-speculative Branch Misprediction (JEClear)",
+        "MetricName": "IpMispredict"
+    },
+    {
+        "MetricExpr": "INST_RETIRED.ANY / BR_INST_RETIRED.ALL_BRANCHES",
+        "BriefDescription": "Instructions per Branch (lower number means higher occurrence rate)",
+        "MetricName": "IpBranch"
+    },
+    {
+        "MetricExpr": "INST_RETIRED.ANY",
+        "BriefDescription": "Total number of retired Instructions",
+        "MetricName": "Instructions"
+    },
+    {
+        "MetricExpr": "64 * LONGEST_LAT_CACHE.MISS / 1000000000 ",
+        "BriefDescription": "Average per-core data fill bandwidth to the L3 cache [GB / sec]",
+        "MetricName": "L3_Cache_Fill_BW"
+    },
+    {
+        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC / msr@tsc@",
+        "BriefDescription": "Average CPU Utilization",
+        "MetricName": "CPU_Utilization"
+    },
+    {
+        "MetricExpr": "(cycles / CPU_CLK_UNHALTED.REF_TSC) * msr@tsc@ / 1000000000 ",
+        "BriefDescription": "Measured Average Frequency for unhalted processors [GHz]",
+        "MetricName": "Average_Frequency"
+    },
+    {
+        "MetricExpr": "cycles / CPU_CLK_UNHALTED.REF_TSC",
+        "BriefDescription": "Average Frequency Utilization relative nominal frequency",
+        "MetricName": "Turbo_Utilization"
+    },
+    {
+        "MetricExpr": "cycles:k / cycles",
+        "BriefDescription": "Fraction of cycles spent in the Operating System (OS) Kernel mode",
+        "MetricName": "Kernel_Utilization"
+    }
+]