MFC 252576:

MFC 252576:
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
Approved by:	re (marius)

git-svn-id: svn://svn.freebsd.org/base/stable/9@253426 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f