ARM: omap2plus_defconfig: Enable DRM_TI_TFP410

The TFP410 driver was removed but the replacement driver was
never enabled.  This patch enableds the DRM_TI_TFP410

Fixes: be3143d8

 ("drm/omap: Remove TFP410 and DVI connector drivers")

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>