perf jevents: Raise exception for no definition of a arch std event

Recently Ilkka reported that the JSONs for the AmpereOne arm64-based
platform included a dud event which referenced a non-existent arch std
event [0].

Previously in the times of jevents.c, we would raise an exception for this.

This is still invalid, even though the current code just ignores such an
event.

Re-introduce code to raise an exception for when no definition exists to
help catch as many invalid JSONs as possible.

[0] https://lore.kernel.org/linux-perf-users/[email protected]/

Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: John Garry <[email protected]>
Tested-by: Ilkka Koskinen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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