media: exynos4-is: Add missing of_node_put to fix reference leaks

Drop the reference to "parallel-ports" and remote endpoint's parent
nodes obtained previously with of_get_child_by_name() and
of_get_parent() respectively.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>