kernel: guard functionality that requires kprobes

Since upstream is now making kprobes a requirement, we adapt this tree to still allow
building with manual hooks in an easier way. Furthermore, this also allows a user to
build with manual hooks even with kprobes enabled.

Offending commit:
	kernel: remove unused CONFIG guard becuase GKI kernel enable kprobe by default
	upstream: https://github.com/tiann/KernelSU/commit/500ff9b

Other changes:
	ksud.c, stop_input_hook(), short-circuit redundant logic left by this change.
	cherry pick from: https://github.com/backslashxx/KernelSU/commit/a3d3e93

Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.com>

kernel/ksu.c

@@ -11,6 +11,10 @@
 #include "ksu.h"
 #include "throne_tracker.h"
 
+#ifdef MODULE
+#define CONFIG_KSU_WITH_KPROBES
+#endif
+
 static struct workqueue_struct *ksu_workqueue;
 
 bool ksu_queue_work(struct work_struct *work)
@@ -57,7 +61,7 @@ int __init kernelsu_init(void)
 
 	ksu_throne_tracker_init();
 
-#ifdef CONFIG_KPROBES
+#ifdef CONFIG_KSU_WITH_KPROBES
 	ksu_sucompat_init();
 	ksu_ksud_init();
 #else
@@ -80,7 +84,7 @@ void kernelsu_exit(void)
 
 	destroy_workqueue(ksu_workqueue);
 
-#ifdef CONFIG_KPROBES
+#ifdef CONFIG_KSU_WITH_KPROBES
 	ksu_ksud_exit();
 	ksu_sucompat_exit();
 #endif