Add pmu events for A64FX.

Documentation source:

  https://github.com/fujitsu/A64FX/blob/master/doc/A64FX_PMU_Events_v1.2.pdfSigned-off-by: Nakamura, Shunsuke/中村 俊介 <nakamura.shun@fujitsu.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Tested-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lore.kernel.org/lkml/20210308105342.746940-3-nakamura.shun@fujitsu.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>