x86/hyperv: Check frequency MSRs presence according to the specification

Hyper-V TLFS specifies two bits which should be checked before accessing
frequency MSRs:

- AccessFrequencyMsrs (BIT(11) in EAX) which indicates if we have access to
  frequency MSRs.
- FrequencyMsrsAvailable (BIT(8) in EDX) which indicates is these MSRs are
  present.
  
Rename and specify these bits accordingly.

Signed-off-by: Vitaly Kuznetsov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Cc: Haiyang Zhang <[email protected]>
Cc: Ladi Prosek <[email protected]>
Cc: Jork Loeser <[email protected]>
Cc: [email protected]
Cc: "K. Y. Srinivasan" <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]

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