perf test: Add a shell wrapper for "Setup struct perf_event_attr"

The "Setup struct perf_event_attr" test in attr.c does a bunch of
directory finding to set up running a python test that in general is
more brittle than similar logic we have in shell tests. Add a shell
test that invokes and runs the tests in the python attr.py script.

Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Athira Rajeev <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: zhaimingbing <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Ze Gao <[email protected]>
Cc: Weilin Wang <[email protected]>
Cc: James Clark <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Thomas Richter <[email protected]>
Cc: Veronika Molnarova <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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