tracing: Allow the top level trace_marker to write into another instances

There are applications that have it hard coded to write into the top level
trace_marker instance (/sys/kernel/tracing/trace_marker). This can be
annoying if a profiler is using that instance for other work, or if it
needs all writes to go into a new instance.

A new option is created called "copy_trace_marker". By default, the top
level has this set, as that is the default buffer that writing into the
top level trace_marker file will go to. But now if an instance is created
and sets this option, all writes into the top level trace_marker will also
be written into that instance buffer just as if an application were to
write into the instance's trace_marker file.

If the top level instance disables this option, then writes to its own
trace_marker and trace_marker_raw files will not go into its buffer.

If no instance has this option set, then the write will return an error
and errno will contain ENODEV.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250508095639.39f84eda@gandalf.local.home


Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>