If your server is up, back out can be done easily
First make sure /etc/zypp/zypp.conf has
multiversion = provides:multiversion(kernel)
multiversion.kernels = latest,latest-1,running
Then simply install the old one
zypper install kernel-default-4.4.126-94.22.1.s390x --oldpackage
And remove the new one
zypper remove kernel-default-4.4.131-94.29-default
That should do it.
Reboot
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