perf vendor events: Update Skylake client events to v50

- Update Skylake events to v50.
- Update Skylake JSON metrics from TMAM 4.0.
- Fix the issue in DRAM_Parallel_Reads
- Fix the perf test warning

Before:

  root@kbl-ppc:~# perf stat -M DRAM_Parallel_Reads -- sleep 1
  event syntax error: '{arb/event=0x80,umask=0x2/,arb/event=0x80,umask=0x2,thresh=1/}:W'
                       \___ unknown term 'thresh' for pmu 'uncore_arb'

  valid terms: event,edge,inv,umask,cmask,config,config1,config2,name,period,percore

  Initial error:
  event syntax error: '..umask=0x2/,arb/event=0x80,umask=0x2,thresh=1/}:W'
                                    \___ Cannot find PMU `arb'. Missing kernel support?

  root@kbl-ppc:~# perf test metrics
  10: PMU events                                 :
  10.3: Parsing of PMU event table metrics               : Skip (some metrics failed)
  10.4: Parsing of PMU event table metrics with fake PMUs: Ok
  67: Parse and process metrics                  : Ok

After:

  root@kbl-ppc:~# perf stat -M MEM_Parallel_Reads -- sleep 1

   Performance counter stats for 'system wide':

           4,951,646      arb/event=0x80,umask=0x2/ #    26.30 MEM_Parallel_Reads       (50.04%)
             188,251      arb/event=0x80,umask=0x2,cmask=1/                                     (49.96%)

         1.000867010 seconds time elapsed

  root@kbl-ppc:~# perf test metrics
  10: PMU events                                 :
  10.3: Parsing of PMU event table metrics               : Ok
  10.4: Parsing of PMU event table metrics with fake PMUs: Ok
  67: Parse and process metrics                  : Ok

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Tested-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/lkml/93fae76f-ce2b-ab0b-3ae9-cc9a2b4cbaec@linux.intel.com/


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>