drivers: pcie: fix inverted translation for PCIe controller

Invert the physical address given to pcie_ctrl_region_translate() to
match the PCI BAR layout. Previously, physical addresses for memory
space BAR were exposed to bit 3 (prefetchable bit) and 2 (1 type bit) of
the header.

Signed-off-by: Rodrigo Cataldo <rodrigo.cataldo@huawei.com>