perf: Use sample_flags for addr

Use the new sample_flags to indicate whether the addr field is filled by
the PMU driver.  As most PMU drivers pass 0, it can set the flag only if
it has a non-zero value.  And use 0 in perf_sample_output() if it's not
filled already.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220921220032.2858517-1-namhyung@kernel.org