Blacklist known broken machines to use the rsdt and enabled Cstates on R40e

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Compile tested.
R40e has been tested to have working C-states when the rsdt is used with another
patchset some time ago.
The R50e has been tested to boot much faster when using the rsdt.
Lenovo confirmed that this is due to BIOS bugs (wrong 64 bit addresses in a FADT pointed to
by the XSDT) which will not be fixed, because the machines are too old.

    Thomas


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