KVM: nSVM: Don't initialize vmcb02 MSRPM with vmcb01's "always passthrough"

Don't initialize vmcb02's MSRPM with KVM's set of "always passthrough"
MSRs, as KVM always needs to consult L1's intercepts, i.e. needs to merge
vmcb01 with vmcb12 and write the result to vmcb02.  This will eventually
allow for the removal of svm_vcpu_init_msrpm().

Note, the bitmaps are truly initialized by svm_vcpu_alloc_msrpm() (default
to intercepting all MSRs), e.g. if there is a bug lurking elsewhere, the
worst case scenario from dropping the call to svm_vcpu_init_msrpm() should
be that KVM would fail to passthrough MSRs to L2.

Link: https://lore.kernel.org/r/20250610225737.156318-13-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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