perf vendor events: Drop support for unused topic directories

Currently a topic subdirectory is supported in the pmu-events dir, in
the following sample structure: /arch/platform/subtopic/mysubtopic.json

Upto 256 levels of topic subdirectories are supported. So this means
that JSONs may be located in a topic dir as well as the platform dir.

This topic subdirectory causes problems if we want to add support for a
vendor dir in the pmu-events structure (in the form
arch/platform/vendor), in that we cannot differentiate between a vendor
dir and a topic dir.

Since the topic dir feature is not used, drop it so it does not block
adding vendor subdirectory support.

Signed-off-by: John Garry <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Ganapatrao Kulkarni <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Shaokun Zhang <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: William Cohen <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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