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/apk_sign.h

@@ -4,6 +4,6 @@
 #include <linux/types.h>
 #include "ksu.h"
 
-bool ksu_is_manager_apk(char *path);
+bool is_manager_apk(char *path);
 
 #endif