ARM: dts: exynos: Fix DTC unit name warnings in Exynos4

Fix following DTC warnings in all Exynos4 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>