ARM: dts: exynos: Fix unit addresses of PDMA nodes in Exynos5410

Fix the unit addresses of PDMA nodes in Exynos5410 (the reg property is
correct) to get rid of DTC warnings like:

    arch/arm/boot/dts/exynos5410-odroidxu.dtb: Warning (simple_bus_reg):
        Node /soc/amba/pdma@12680000 simple-bus unit address format error, expected "121a0000"

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>