CONFIG_DRM=y
CONFIG_DRM_OMAP=y
CONFIG_OMAP2_DSS_DPI=y //for me with parallel Display support
CONFIG_DRM_TILCDC=y // Display in general
CONFIG_DRM_PANEL_SIMPLE=y //simple Panel
CONFIG_DRM_FBDEV_EMULATION=y 
maybe you need:
CONFIG_OMAP2_DSS_SDI=y //serial
CONFIG_OMAP2_DSS_DSI=y //mipi