perf/bpf: Remove #ifdef CONFIG_BPF_SYSCALL from struct perf_event members

This will allow __perf_event_overflow() (which is independent of
CONFIG_BPF_SYSCALL) to use struct perf_event's prog to decide whether to
call bpf_overflow_handler().
Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Kyle Huey <khuey@kylehuey.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20240412015019.7060-4-khuey@kylehuey.com

include/linux/perf_event.h

@@ -809,11 +809,9 @@ struct perf_event {
 	u64				(*clock)(void);
 	perf_overflow_handler_t		overflow_handler;
 	void				*overflow_handler_context;
-#ifdef CONFIG_BPF_SYSCALL
 	perf_overflow_handler_t		orig_overflow_handler;
 	struct bpf_prog			*prog;
 	u64				bpf_cookie;
-#endif
 
 #ifdef CONFIG_EVENT_TRACING
 	struct trace_event_call		*tp_event;