kernel: Remove macro definitions, pass variables using ccflags -y, and reapply manual su protection.

kernel: stop printing useless message unless its ddk environment
* In-tree build show empty KDIR

-- KDIR:
-- MDIR: /home/runner/work/KernelSU-Test/KernelSU-Test/kernel_414/KernelSU/kernel
  AR      drivers/iommu/built-in.o
  CC      drivers/input/misc/uinput.o
-- KernelSU version: 12329
-- KernelSU: CONFIG_KSU_MANUAL_HOOK
-- Supported KernelSU Manager(s): tiann, rsuntk, 5ec1cff
  CC      drivers/kernelsu/ksu.o
  AR      drivers/input/joystick/built-in.o
  CC      drivers/hid/hid-roccat-pyra.o

Co-authored-by: Faris <rissu.ntk@gmail.com>
Co-authored-by: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>

kernel/ksu.c

@@ -57,8 +57,10 @@ int __init kernelsu_init(void)
     ksu_allowlist_init();
 
     ksu_throne_tracker_init();
-#ifdef __KPROBES_HOOK
+
     ksu_sucompat_init();
+
+#ifdef CONFIG_KSU_KPROBES_HOOK
     ksu_ksud_init();
 #else
      pr_alert("KPROBES is disabled, KernelSU may not work, please check https://kernelsu.org/guide/how-to-integrate-for-non-gki.html");
@@ -86,9 +88,10 @@ void kernelsu_exit(void)
 
     destroy_workqueue(ksu_workqueue);
 
-#ifdef __KPROBES_HOOK
-    ksu_ksud_exit();
     ksu_sucompat_exit();
+
+#ifdef CONFIG_KSU_KPROBES_HOOK
+    ksu_ksud_exit();
 #endif
 
 #ifdef CONFIG_KSU_TRACEPOINT_HOOK