Updated microcode tracking and PEBS workaround patchkit

[Andi Kleen]

I addressed (most) of the review comments. The printk for mismatching
ucode is still there. And it's still walking all CPUs, but since that
happens in parallel it's not really exponentially longer delay.

There's a check now for mismatching model numbers and the
minimum ucode tracking is disabled for this case.

Also I implemented CPU loading earlier in the CPU notifier
for the microcode driver.

Also this actually fixes the code, it didn't work before for
hotplugged CPUs and didn't update the microcodes there.

-Andi

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