PCIe controller 5 is in EP mode, there is only eight outbound number.
In other word, configure outbound with dw_pcie_prog_outbound_atu, only index >=0 && index <=7 is valid,
void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
u64 cpu_addr, u64 pci_addr, u32 size);
when index >7, kernel output the error:
tegra-pcie-dw 141a0000.pcie_ep: outbound iATU is not being enabled
if we want more outbound number, 16 is better, how to achieve it?