perf scripting python: Add function to get a config value

This can be used to get config values like which objdump Perf uses for
disassembly.

Reviewed-by: Leo Yan <[email protected]>
Signed-off-by: James Clark <[email protected]>
Tested-by: Ganapatrao Kulkarni <[email protected]>
Cc: Ben Gainey <[email protected]>
Cc: Suzuki K Poulose <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Ruidong Tian <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Benjamin Gray <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: John Garry <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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