MAINTAINERS: Add entries for CoreSight and Arm SPE tooling

Add entries for perf tools elements related to the support of ARM
CoreSight and ARM SPE.  Also lump in arm and arm64 architecture files to
provide coverage.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: John Garry <john.garry@huawei.com>
Acked-by: Will Deacon <will@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lore.kernel.org/lkml/20200820175510.3935932-1-mathieu.poirier@linaro.org


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