perf: Fix missing raw data on tracepoint events

Since commit 838d9bb6 ("perf: Use sample_flags for raw_data")
raw data is not being output on tracepoints due to the PERF_SAMPLE_RAW
field not being set. Fix this by setting it for tracepoint events.

This fixes the following test failure:

  perf test "sched_switch" -vvv

   35: Track with sched_switch
  --- start ---
  test child forked, pid 1828
  ...
  Using CPUID 0x00000000410fd400
  sched_switch: cpu: 2 prev_tid -14687 next_tid 0
  sched_switch: cpu: 2 prev_tid -14687 next_tid 0
  Missing sched_switch events
  4613 events recorded
  test child finished with -1
  ---- end ----
  Track with sched_switch: FAILED!

Fixes: 838d9bb6 ("perf: Use sample_flags for raw_data")
Signed-off-by: James Clark <james.clark@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: SeongJae Park <sj@kernel.org>
Tested-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20221012143857.48198-1-james.clark@arm.com