Revoke ftrace selinux access from dumpstate

Getting rid of the feature in aosp/874979.
See other CL and bug for context.

Bug: 122987614
Bug: 122987614
Test: run dumpstate before and after patch,
      file sizes are comparable,
      observed no tracing-related errors.
Change-Id: Ifcde8dcbb99ce53d226b50ddd3178adaaa4322bd