drm/exynos: remove MODULE_DEVICE_TABLE definitions

This patch removes MODULE_DEVICE_TABLE definition to of_device_id
of DP and MIPI-DSI drivers.

Eyxnos drm should be built as single module so these definitions
should be removed.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>