arm64: dts: lg1312: DT fix s/#interrupts-cells/#interrupt-cells/

The standard DT property is called "#interrupt-cells".

Link: https://lore.kernel.org/r/20191101160356.32034-1-geert+renesas@glider.be


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Chanho Min <chanho.min@lge.com>
Signed-off-by: Olof Johansson <olof@lixom.net>