PCI: j721e: Add PCIe support for J722S SoC

TI's J722S SoC has one instance of PCIe namely PCIe0 which is a Gen3
single lane PCIe controller. Add support for the "ti,j722s-pcie-host"
compatible specific to J722S SoC.

Link: https://lore.kernel.org/r/20240524092349.158443-1-s-vadapalli@ti.com


Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>