Remove the usage of skeleton.dtsi to fix the DTC warnings:

    arch/arm/boot/dts/s3c6410-mini6410.dtb: Warning (unit_address_vs_reg):
        /memory: node has a reg or ranges property, but no unit name
    arch/arm/boot/dts/s3c6410-smdk6410.dtb: Warning (unit_address_vs_reg):
        /memory: node has a reg or ranges property, but no unit name
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>