MAINTAINERS: update maintainer entry for Exynos DP driver

Recently, Exynos DP driver was moved from drivers/video/exynos/
directory to drivers/gpu/drm/exynos/ directory. So, I update
and add maintainer entry for Exynos DP driver.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

MAINTAINERS

@@ -3485,6 +3485,12 @@ S:	Maintained
 F:	drivers/extcon/
 F:	Documentation/extcon/
 
+EXYNOS DP DRIVER
+M:	Jingoo Han <jg1.han@samsung.com>
+L:	dri-devel@lists.freedesktop.org
+S:	Maintained
+F:	drivers/gpu/drm/exynos/exynos_dp*
+
 EXYNOS MIPI DISPLAY DRIVERS
 M:	Inki Dae <inki.dae@samsung.com>
 M:	Donghwa Lee <dh09.lee@samsung.com>