kernel: remove unused CONFIG guard becuase GKI kernel enable kprobe by default

kernel/core_hook.c

@@ -862,9 +862,7 @@ void __init ksu_core_init(void)
 
 void ksu_core_exit(void)
 {
-#ifdef CONFIG_KPROBES
 	pr_info("ksu_core_kprobe_exit\n");
 	// we dont use this now
 	// ksu_kprobe_exit();
-#endif
 }