It is found that SOS will reset the PCI devices under PCI
bridge 00:1c.0 when 00:1c.0 is exposed to SOS. If a PCI
device under 00:1c.0 is passed through to pre-launched VM,
it will be reset by SOS at startup hence the passthrough
will not work properly. This patch provides a workaround
by hiding PCI bridge 00:1c.0 from SOS in this case.
Tracked-On: #5346
Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>