perf bpf-prologue: Remove unused file

Commit 3d6dfae8 ("perf parse-events: Remove BPF event support")
removed building bpf-prologue.c but failed to remove the actual file.

Fixes: 3d6dfae8 ("perf parse-events: Remove BPF event support")
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20230913184534.227961-1-irogers@google.comSigned-off-by: Namhyung Kim <namhyung@kernel.org>