AMD Family 19h Microcode Update: Inception Vulnerability Mitigation

Following yesterday's disclosure of the AMD "Inception" security vulnerability and the Linux kernel patches merged for reporting the mitigation status as well as the kernel-based handling for earlier generation Zen CPUs, the Family 19h microcode mitigations have now been picked up by the linux-firmware.git repository.

Mitigating the Inception vulnerability for Zen 3 and Zen 4 processors mean updated microcode while earlier Zen CPUs can get by with the kernel patches alone. Today the AMD Family 19h CPU microcode was updated, which covers Zen 3 / Zen 3+ / Zen 4 processors. 

The update today landed with this commit. As usual there is no formal change-log but simply:

* Update AMD cpu microcode for processor family 19h

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