not working when CONFIG_TRACEFS_DISABLE_AUTOMOUNT enabled

when CONFIG_TRACEFS_DISABLE_AUTOMOUNT is enabled in kernel config, the kernel won't automount tracefs when mount debugfs, so the `/sys/kernel/debug/tracing` is not exist, we should use `/sys/kernel/tracing` instead.

Here is the kernel chanelog: https://osdn.net/projects/android-x86/scm/git/kernel/commits/412bd71850dbd2d78ee3bbd1e43e3ebe3c9bd819

And the mount:

```
oriole:/ # mount -t tracefs
tracefs on /sys/kernel/tracing type tracefs (rw,seclabel,relatime,gid=3012)
```

When we umount debugfs and remount, the `/sys/kernel/debug/tracing` is not exist, and we can't mount the tracefs to `/sys/kernel/debug/tracing` becase there isn't any mount point.

I replace all `/sys/kernel/debug/tracing` to `/sys/kernel/tracing` in the source code and compile it again can make it work.

Search the C source for references to `/sys/kernel/debug/tracing` and inspect the tracefs/debugfs mount handling. Reproduce the issue with CONFIG_TRACEFS_DISABLE_AUTOMOUNT enabled, then verify tracing still works through `/sys/kernel/tracing` after debugfs is unmounted and remounted.

Written by the indexing model from the issue text.