[PATCH 09/14] tools/perf: Add event name as vpa-dtl of PERF_TYPE_SYNTH type to present DTL samples

[Athira Rajeev]

Dispatch Trace Log details are captured as-is in PERF_RECORD_AUXTRACE
records. To present dtl entries as samples, create an event with name as
"vpa-dtl" and type PERF_TYPE_SYNTH. Add perf_synth_id,
"PERF_SYNTH_POWERPC_VPA_DTL" as config value for the event. Create a
sample id to be a fixed offset from evsel id.
To present the relevant fields from the "struct dtl_entry",
prepare the entries as events of type PERF_TYPE_SYNTH. By
defining as PERF_TYPE_SYNTH type, samples can be printed as part of
perf_sample__fprintf_synth in builtin-script.c