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/allowlist.c

@@ -266,7 +266,7 @@ bool __ksu_is_allow_uid(uid_t uid)
 
 	if (unlikely(uid == 0)) {
 		// already root, but only allow our domain.
-		return ksu_is_ksu_domain();
+		return is_ksu_domain();
 	}
 
 	if (forbid_system_uid(uid)) {