ARM: dts: s5pv210: Fix onenand's unit address format warning

According to Devicetree specification, the unit-address must match the
first address specified in the reg property of the node.  Fix the DTC
warning onenand node:

    arch/arm/boot/dts/s5pv210.dtsi:81.29-93.5:
        Warning (simple_bus_reg): /soc/onenand@b0000000: simple-bus unit address format error, expected "b0600000"

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>