perf vendor events: Update SkylakeX events to v1.21

perf vendor events: Update SkylakeX events to v1.21

- Update SkylakeX events to v1.21.
- Update SkylakeX JSON metrics from TMAM 4.0.

Other fixes:

- Add NO_NMI_WATCHDOG metric constraint to Backend_Bound
- Fix misspelled error

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.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/20200922031918.3723-1-yao.jin@linux.intel.com/
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>