arm64: dts: ti: k3-j721s2-main: Add PCIe device tree node

Add PCIe1 RC device tree node for the single PCIe instance present on
the J721S2.

Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Matt Ranostay <mranostay@ti.com>
Signed-off-by: Ravi Gunasekaran <r-gunasekaran@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20230331090028.8373-8-r-gunasekaran@ti.com


Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>