pci: Move pci_hose_phys_to_bus() to pci_common.c

pci_hose_phys_to_bus() is needed by several drivers. Move it to
pci_common.c to avoid a broken build when CONFIG_DM_PCI is on.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>