perf cs-etm: Support PID tracing in config

perf cs-etm: Support PID tracing in config

If the kernel is running at EL2, the pid of a task is exposed via VMID
instead of the CONTEXTID.  Add support for this in the perf tool.

This patch respects user setting if user has specified any configs
from "contextid", "contextid1" or "contextid2"; otherwise, it
dynamically sets config based on PMU format "contextid".

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Co-developed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Al Grant <al.grant@arm.com>
Link: https://lore.kernel.org/r/20210213113220.292229-4-leo.yan@linaro.org
Link: https://lore.kernel.org/r/20210224164835.3497311-5-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>