Fix virtual TPM in Linux guests
I run CentOS 7 and RHEL 7 virtual machines on a Hyper-V Server 2016.
Virtual TPMs in the VMs somehow worked, at least as entropy sources, before June 2017 Patch Tuesday. After I've applied the latest cumulative patch every TPM got broken on the next VM restart.
The bug is a regression between 14393.1230 and 14393.1358.
(I've downgraded and everything seems fine now.)