KVM: nVMX: Don't set 'dirty_vmcs12' flag on enlightened VMPTRLD

'dirty_vmcs12' is only checked in prepare_vmcs02_early()/prepare_vmcs02()
and both checks look like:

 'vmx->nested.dirty_vmcs12 || evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)'

so for eVMCS case the flag changes nothing. Drop the assignment to avoid
the confusion.

No functional change intended.
Reported-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210526132026.270394-3-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx/nested.c

@@ -2021,7 +2021,6 @@ static enum nested_evmptrld_status nested_vmx_handle_enlightened_vmptrld(
 			return EVMPTRLD_VMFAIL;
 		}
 
-		vmx->nested.dirty_vmcs12 = true;
 		vmx->nested.hv_evmcs_vmptr = evmcs_gpa;
 
 		evmcs_gpa_changed = true;