cpuid_test_kernel: print all leaves at 0x40000100

The KVM signature at 0x40000100 implies that the active features are
at 0x40000101 (though QEMU is buggy right now).  Print that leaf too
if KVM is found at 0x40000100.

However, the Hyper-V signature can only be at 0x40000000.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>