[PATCH 0/2] Fix TSC ADJUST breakage causing TSC failure

[Mike Travis]

Fix a breakage caused by enabling early tsc initialization which bypasses
a check that disables the forcing of TSC ADJUST to 0 for chassis 0.
This is common on systems where all the chassis start up asynchronously
so which chassis should have a TSC ADJUST value of 0 is not predictable.

The solution is to add a check earlier than this early tsc init to
disable the potential of it incorrectly adjusting TSC ADJUST values that
are already correctly initialized.

*  Patch 1 adds an early callable function (after efi_init) that will
   check if this system might be a UV system.

*  Patch 2 adds code to tsc_early_init() which disables adjusting the
   TSC ADJUST value if it's a UV system.  This allows the later tsc_init
   function to test the tsc_async_resets flag that indicates the system
   chassis start up asynchronously, so which chassis should have a TSC
   ADJUST value of 0 is not predictable.  Further references are in
   the patch.

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