KVM: X86: Fix initialization of MSR lists

The three MSR lists(msrs_to_save[], emulated_msrs[] and
msr_based_features[]) are global arrays of kvm.ko, which are
adjusted (copy supported MSRs forward to override the unsupported MSRs)
when insmod kvm-{intel,amd}.ko, but it doesn't reset these three arrays
to their initial value when rmmod kvm-{intel,amd}.ko. Thus, at the next
installation, kvm-{intel,amd}.ko will do operations on the modified
arrays with some MSRs lost and some MSRs duplicated.

So define three constant arrays to hold the initial MSR lists and
initialize msrs_to_save[], emulated_msrs[] and msr_based_features[]
based on the constant arrays.

Cc: [email protected]
Reviewed-by: Xiaoyao Li <[email protected]>
Signed-off-by: Chenyi Qiang <[email protected]>
[Remove now useless conditionals. - Paolo]
Signed-off-by: Paolo Bonzini <[email protected]>

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