The full size of the BAR is stored in the lower PCIIORegion.size. The
upper PCIIORegion.size is 0.  Calculate the size of the upper half
correctly from the lower half otherwise the size read by the guest will
be incorrect.
Signed-off-by: NRoss Lagerwall <ross.lagerwall@citrix.com>
Acked-by: NAnthony PERARD <anthony.perard@citrix.com>
Signed-off-by: NStefano Stabellini <sstabellini@kernel.org>