Fix a couple of bugs that prevented windows in PCI-PCI bridges from growing "downward" (moving the start address down).  First, an off by one error caused the end address to be moved down an extra alignment chunk unnecessarily.  Second, when aligning the new candidate starting address, the wrong bits were masked off.
Fix a couple of bugs that prevented windows in PCI-PCI bridges from
growing "downward" (moving the start address down).  First, an off by
one error caused the end address to be moved down an extra alignment
chunk unnecessarily.  Second, when aligning the new candidate starting
address, the wrong bits were masked off.

Tested by:	Andrey Zonov  andrey zonov org
MFC after:	3 days

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