tracing/rv/rtla: Update MAINTAINERS file to point to proper mailing list

The mailing list that goes to linux-trace-devel is for the tracing
libraries, and the patchwork associated to the tracing libraries keys
off of that mailing list.

For anything that lives in the Linux kernel proper (including the tools
directory) must go through linux-trace-kernel, as the patchwork to that
list keys off of the Linux kernel proper.

Update the MAINTAINERS file to reflect the proper mailing lists.

Link: https://lore.kernel.org/linux-trace-kernel/20230529044002.0481452b@rorschach.local.home



Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>