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/core_hook.h

@@ -7,4 +7,10 @@
 void __init ksu_core_init(void);
 void ksu_core_exit(void);
 
+void escape_to_root(void);
+
+void nuke_ext4_sysfs(void);
+
+extern bool ksu_module_mounted;
+
 #endif