Fix following DTC warnings in Exynos3250 boards:

Warning (unit_address_vs_reg): Node /soc/video-phy@10020710 has a unit name, but no reg property
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>