fdt: Add several apis to decode pci device node

fdt: Add several apis to decode pci device node

This commit adds several APIs to decode PCI device node according to
the Open Firmware PCI bus bindings, including:
- fdtdec_get_pci_addr() for encoded pci address
- fdtdec_get_pci_vendev() for vendor id and device id
- fdtdec_get_pci_bdf() for pci device bdf triplet
- fdtdec_get_pci_bar32() for pci device register bar

Signed-off-by: Bin Meng <[email protected]>
Acked-by: Simon Glass <[email protected]>
Signed-off-by: Simon Glass <[email protected]>
(Include <pci.h> in fdtdec.h and adjust tegra to fix build error)