maintainers: Add docs/tracing.txt to Tracing
The topic of whether and by whom docs/tracing.txt is maintained was
brought up. It currently does not have an official maintainer.
Add it to the tracing section so that Stefan gets cc'ed on patches.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Acked-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Andreas Färber