video: exynos_dp: add missing of_node_put()

of_find_node_by_name() returns a node pointer with refcount
incremented, use of_node_put() on it when done.

of_find_node_by_name() will call of_node_put() against
the node pass to from parameter, thus we also need to call
of_node_get(from) before calling of_find_node_by_name().

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
video: exynos_dp: move disable_irq() to exynos_dp_suspend()

disable_irq() should be moved to exynos_dp_suspend(), because
enable_irq() is called at exynos_dp_resume().

Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Signed-off-by: Jingoo Han <jg1.han@samsung.com>