arm64: dts: ti: k3-j721e-main: Remove "syscon" nodes added for pcieX_ctrl

Remove "syscon" nodes added for pcieX_ctrl and have the PCIe node point
to the parent with an offset argument. This change is as discussed in [1].

[1] -> http://lore.kernel.org/r/CAL_JsqKiUcO76bo1GoepWM1TusJWoty_BRy2hFSgtEVMqtrvvQ@mail.gmail.com



Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20210105151421.23237-3-kishon@ti.com