MFC: add 1 microsecond delay to pci_add_children() bus enumeration loop to pacify certain PCI bridges ('fixes' problem with USB controllers not being probed on some Sun AMD8111 machines, notably mine).
MFC: add 1 microsecond delay to pci_add_children() bus enumeration loop
to pacify certain PCI bridges ('fixes' problem with USB controllers
not being probed on some Sun AMD8111 machines, notably mine).

Approved by:	re

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase