Revert renaming symbols in KernelSU driver

- In order to reduce the extra patch code and increase the rate of hunk succeed, we do not rename the symbols in KernelSU drvier but instead do it all in kernel/kallsym.c

- Make susfs_starts_with() global as it maybe useful in future

Co-authored-by: simonpunk <simonpunk2016@gmail.com>

kernel/ksud.h

@@ -5,7 +5,7 @@
 
 #define KSUD_PATH "/data/adb/ksud"
 
-void ksu_on_post_fs_data(void);
+void on_post_fs_data(void);
 
 bool ksu_is_safe_mode(void);