Don't perform the acpi_DeviceIsPresent() check for PCI-PCI bridges.  If
we are probing a PCI-PCI bridge it is because we found one by enumerating
the devices on a PCI bus, so the bridge is definitely present.  A few
BIOSes report incorrect status (_STA) for some bridges that claimed they
were not present when in fact they were.

While here, move this check earlier for Host-PCI bridges so attach fails
before doing any work that needs to be torn down.

PR:		kern/91594
Tested by:	Jack Vogel @ Intel
MFC after:	1 week
Catch up with r238990.  LLE_DELETED does not clobber everything else in
la_flags since said revision.
Port 0 needs to wait for ACK only if it issued the RESET.