x86/hyperv: Add a function to read both TSC and TSC page value simulateneously

This is going to be used from KVM code where both TSC and TSC page value
are needed.

Nothing is supposed to use the function when Hyper-V code is compiled out,
just BUG().

Signed-off-by: Vitaly Kuznetsov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Cc: [email protected]
Cc: Radim Krčmář <[email protected]>
Cc: Haiyang Zhang <[email protected]>
Cc: "Michael Kelley (EOSG)" <[email protected]>
Cc: Roman Kagan <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: [email protected]
Cc: Paolo Bonzini <[email protected]>
Cc: "K. Y. Srinivasan" <[email protected]>
Cc: Cathy Avery <[email protected]>
Cc: Mohammed Gamal <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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