drm/exynos: Add missing includes

Ensure that all externally accessed functions are correctly prototyped
when defined in each file by making sure the headers with the protoypes
are included in the file with the definition.

Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimc.c b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
index 6e047bd..a8ab4a4 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
@@ -21,6 +21,7 @@
 #include <drm/drmP.h>
 #include <drm/exynos_drm.h>
 #include "regs-fimc.h"
+#include "exynos_drm_drv.h"
 #include "exynos_drm_ipp.h"
 #include "exynos_drm_fimc.h"