realtek: Update rtl839x.dtsi for realtek,rtl-intc, new gpio controller remove RTL8231 node

Update the IRQ configuration to work with the new rtl-intc controller.
Also change all KSEG1 addresses in reg = <> of the devics to physical
addresses.

Use the new gpio-otto controller instead of the legacy driver.
Also remove the memory node as this is better put into a device .dts.

Also remove the RTL8231 GPIO controller node from this base file
since the chip might not be found in all Realtek RTL839x devices.

Signed-off-by: Birger Koblitz <git@birger-koblitz.de>