perf parse-events: Introduce 'struct parse_events_terms'

parse_events_terms() existed in function names but was passed a
'struct list_head'.

As many parse_events functions take an evsel_config list as well as a
parse_event_term list, and the naming head_terms and head_config is
inconsistent, there's a potential to switch the lists and get errors.

Introduce a 'struct parse_events_terms', that just wraps a list_head, to
avoid this. Add the regular init/exit functions and transition the code
to use them.

Reviewed-by: James Clark <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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