TI's J784S4 SoC has four instances of Gen3 PCIe Controllers namely
PCIe0, PCIe1, PCIe2 and PCIe3. PCIe0 and PCIe1 are 4-Lane controllers
while PCIe2 and PCIe3 are 2-Lane controllers.

Add support for the Root Complex Mode of operation of these PCIe instances.
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Link: https://lore.kernel.org/r/20240529082259.1619695-2-s-vadapalli@ti.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>