[PATCH v1] drivers: pci: introduce configurable delay for Rockchip PCIe bus scan

[Tom Fitzhenry]

My RockPro64 occasionally failed on boot with this crash dump, at least
since Linux 5.15. Since Linux 6.5, every boot fails in this manner.

I applied a similar patch[0] against Linux 6.6 that sleeps during probe,
and I'm now able to boot successfully each time.

0. https://gitlab.manjaro.org/manjaro-arm/packages/core/linux/-/blob/44e81d83b7e002e9955ac3c54e276218dc9ac76d/1005-rk3399-rp64-pcie-Reimplement-rockchip-PCIe-bus-scan-delay.patch