ARM: dts: exynos: Use label instead of full path in exynos4412-itop-elite

Extend camera node by label, not by full path in Exynos
4412 Itop Elite.  This avoids error-prone redefinition of nodes.

Signed-off-by: Maciej Purski <m.purski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>