perf print-events: Remove print_hwcache_events

perf print-events: Remove print_hwcache_events

Now legacy cache events are in json there's no need for a specific
printing routine. To support the previous filtered version use an
event glob of "legacy cache" which matches the topic of the json
events.

Tested-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>