drm/xe/perf/uapi: Add perf_stream_paranoid sysctl

Normally only superuser/root can access perf counter data. However,
superuser can set perf_stream_paranoid sysctl to 0 to allow non-privileged
users to also access perf data. perf_stream_paranoid is introduced at the
perf layer to allow different perf stream types to share this access
mechanism.

v2: Add kernel doc for non-static functions (Michal)

Acked-by: Rodrigo Vivi <[email protected]>
Acked-by: José Roberto de Souza <[email protected]>
Reviewed-by: Umesh Nerlige Ramappa <[email protected]>
Signed-off-by: Ashutosh Dixit <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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