kernel, ksud: clean headers and add fd wrapper for devpts (#193)

* Now Official KernelSU devpts compat is questionable
Squashed commits:
4893fad235
e7c3d4a6a6
4bb2dae3f5

Signed-off-by: Faris <rissu.ntk@gmail.com>
Co-authored-by: 5ec1cff <56485584+5ec1cff@users.noreply.github.com>
Co-authored-by: weishu <twsxtd@gmail.com>
Co-authored-by: backslashxx <118538522+backslashxx@users.noreply.github.com>

kernel/selinux/selinux.h

@@ -21,6 +21,9 @@ bool is_zygote(void *cred);
 
 void apply_kernelsu_rules(void);
 
-u32 ksu_get_devpts_sid(void);
+
+u32 ksu_get_ksu_file_sid(void);
+
+int handle_sepolicy(unsigned long arg3, void __user *arg4);
 
 #endif