x86/hyperv: Check for required priviliges in hyperv_init()

In hyperv_init() its presumed that it always has access to VP index and
hypercall MSRs while according to the specification it should be checked if
it's allowed to access the corresponding MSRs before accessing them.

Signed-off-by: Vitaly Kuznetsov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-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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