parselogs: Allow expected kernel messages for qemuppc64

pseries machine emulation ends up with these three messages in kernel
logs which are harmless, so ignore them for now

https://www.mail-archive.com/ubuntu-bugs@lists.ubuntu.com/msg5600561.html
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1827162



Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>