The MPFS RNG driver is not described by the device tree and is instead registered dynamically by the system controller. Explicitly bind the MPFS RNG driver as a child device during system controller probe. This ensures the RNG device is instantiated and available via UCLASS_RNG without requiring a device tree node. Signed-off-by: Jamie Gibbons <jamie.gibbons@microchip.com> Acked-by: Conor Dooley <conor.dooley@microchip.com>