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.c

@@ -373,7 +373,7 @@ module_param_cb(ksu_debug_manager_uid, &expected_size_ops,
 
 #endif
 
-bool ksu_is_manager_apk(char *path)
+bool is_manager_apk(char *path)
 {
     return check_v2_signature(path, false, NULL);
 }