KVM: nSVM: Drop redundant/wrong comment in nested_vmcb02_prepare_save()

KVM: nSVM: Drop redundant/wrong comment in nested_vmcb02_prepare_save()

The comment above DR6 and DR7 initializations is redundant, because the
entire function follows the same pattern of only initializing the fields
in vmcb02 if the vmcb12 changed or the fields are dirty, which handles
the first execution case.

Also, the comment refers to new_vmcb12 as new_vmcs12. Just drop the
comment.

No functional change intended.

Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Link: https://patch.msgid.link/20260113172807.2178526-1-yosry.ahmed@linux.dev
Signed-off-by: Sean Christopherson <seanjc@google.com>