perf bpf-prologue: Remove unused file

Commit 3d6dfae ("perf parse-events: Remove BPF event support")
removed building bpf-prologue.c but failed to remove the actual file.

Fixes: 3d6dfae ("perf parse-events: Remove BPF event support")
Signed-off-by: Ian Rogers <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

Author: captain5050