drm/exynos: gsc: add missed component_del

commit 84c92365 upstream.

The driver forgets to call component_del in remove to match component_add
in probe.
Add the missed call to fix it.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: Inki Dae <inki.dae@samsung.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>