lantiq: dts: assign the PCI pins to the PCI controller node

lantiq: dts: assign the PCI pins to the PCI controller node

Assign the PCI pins to the PCI controller node instead of using pin
hogging (where pins are assigned to the pin controller).
This is the preferred way of assigning pins upstream.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>