Correct file qemu-deprecated.texi with respect to the release since
MIPS r4k machine is deprecated from 4.2 to 5.0.

Fixes: d32dc614

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Message-Id: <1579883929-1517-2-git-send-email-aleksandar.markovic@rt-rk.com>