Description of problem:
Trying to run clone of VM with Q35 chipset, failed with the next vdsm.log ERROR:
 2019-02-18 11:50:01,444+0200 ERROR (vm/e86855af) [virt.vm] (vmId='e86855af-8a46-4f6a-bd4d-b4000d7dbdba') The vm start process failed (vm:937)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 866, in _startUnderlyingVm
    self._run()
  File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 2852, in _run
    dom = self._connection.defineXML(self._domain.xml)
  File "/usr/lib/python2.7/site-packages/vdsm/common/libvirtconnection.py", line 131, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/common/function.py", line 94, in wrapper
    return func(inst, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3733, in defineXML
    if ret is None:raise libvirtError('virDomainDefineXML() failed', conn=self)
libvirtError: XML error: The PCI controller with index='0' must be model='pcie-root' for this machine type, but model='(null)' was found instead

Issue is relevant only for clones of VM with Q35 chipset with UEFI BIOS/secure boot.

Version-Release number of selected component (if applicable):
ovirt-engine-4.3.0.5-0.0.master.20190207124642.git415c7e8.el7.noarch
vdsm-4.30.8-58.git60c5a6d.el7.x86_64
qemu-kvm-ev-2.12.0-18.el7_6.3.1.x86_64
libvirt-client-4.5.0-10.el7_6.4.x86_64

How reproducible:
100%

Steps to Reproduce:
1. create clone of VM with Q35 chipset and UEFI BIOS.
2. Try to run cloned VM.
3.

Actual results:
Cloned VM failed to start.

Expected results:
Cloned VM should run.

Additional info:
vdsm.log and engine.log attached.