Correct the end of CardBus memory windows

Correct the end of CardBus memory windows

The low twelve bits of memory base/limit are assumed to be all zeros
and all ones, respectively.  Therefore, a window with base == limit
is a valid 4K window, which we should display by default, and the
true end of the window is ...fff, not ...000.  For example,

    05:07.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
	    ...
-	    Memory window 0: 88000000-8bfff000 (prefetchable)
+	    Memory window 0: 88000000-8bffffff (prefetchable)

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>