perf test: Add a test for strcmp_cpuid_str() expression

Test that the new expression builtin returns a match when the current
escaped CPU ID is given, and that it doesn't match when "0x0" is given.

The CPU ID in test__expr() has to be changed to perf_pmu__getcpuid()
which returns the CPU ID string, rather than the raw CPU ID that
get_cpuid() returns because that can't be used with strcmp_cpuid_str().
It doesn't affect the is_intel test because both versions contain
"Intel".

Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: James Clark <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Chen Zhongjin <[email protected]>
Cc: Eduard Zingerman <[email protected]>
Cc: Haixin Yu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jing Zhang <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Liam Howlett <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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