x86, hyperv: Get the local APIC timer frequency from the hypervisor

Hyper-V supports a mechanism for retrieving the local APIC frequency.
Use this and bypass the calibration code in the kernel . This would
allow us to boot the Linux kernel as a "modern VM" on Hyper-V where
many of the legacy devices (such as PIT) are not emulated.

I would like to thank Olaf Hering <[email protected]>, Jan Beulich <[email protected]> and
H. Peter Anvin <[email protected]> for their help in this effort.

In this version of the patch, I have addressed Jan's comments.

Signed-off-by: K. Y. Srinivasan <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Tested-by: Olaf Hering <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>

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