perf test: Add CoreSight shell lib shared code for future tests

perf test: Add CoreSight shell lib shared code for future tests

This adds a library of shell "code" to be shared and used by future
tests that target quality testing for Arm CoreSight support in perf
and the Linux kernel.

Signed-off-by: Carsten Haitzler <carsten.haitzler@arm.com>
Reviewed-by: James Clark <james.clark@arm.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: coresight@lists.linaro.org
Link: http://lore.kernel.org/lkml/20220909152803.2317006-2-carsten.haitzler@foss.arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>