x86/kprobes: Remove unused arch_kprobe_override_function() declaration

All uses of arch_kprobe_override_function() have been removed by
commit 540adea3 ("error-injection: Separate error-injection
from kprobe"), so remove the declaration, too.

Link: https://lkml.kernel.org/r/20220914110437.1436353-3-cuigaosheng1@huawei.com

Cc: <mingo@redhat.com>
Cc: <tglx@linutronix.de>
Cc: <bp@alien8.de>
Cc: <dave.hansen@linux.intel.com>
Cc: <x86@kernel.org>
Cc: <hpa@zytor.com>
Cc: <mhiramat@kernel.org>
Cc: <peterz@infradead.org>
Cc: <ast@kernel.org>
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

arch/x86/include/asm/kprobes.h

@@ -50,8 +50,6 @@ extern const int kretprobe_blacklist_size;
 
 void arch_remove_kprobe(struct kprobe *p);
 
-extern void arch_kprobe_override_function(struct pt_regs *regs);
-
 /* Architecture specific copy of original instruction*/
 struct arch_specific_insn {
 	/* copy of the original instruction */