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/allowlist.c

@@ -527,6 +527,7 @@ void ksu_allowlist_exit(void)
     mutex_unlock(&allowlist_mutex);
 }
 
+#ifdef CONFIG_KSU_MANUAL_SU
 bool ksu_temp_grant_root_once(uid_t uid)
 {
     struct app_profile profile = {
@@ -601,4 +602,5 @@ void ksu_temp_revoke_root_once(uid_t uid)
     ksu_set_app_profile(&profile, false);
     persistent_allow_list();
     pr_info("pending_root: UID=%d removed and persist updated\n", uid);
-}
+}
+#endif