tracing: Remove the backup instance automatically after read

tracing: Remove the backup instance automatically after read

Since the backup instance is readonly, after reading all data via pipe, no
data is left on the instance. Thus it can be removed safely after closing
all files.  This also removes it if user resets the ring buffer manually
via 'trace' file.

Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://patch.msgid.link/177502547711.1311542.12572973358010839400.stgit@mhiramat.tok.corp.google.com
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>