EXYNOS DRM DP driver support

configname: CONFIG_DRM_EXYNOS_DP

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager
└─>EXYNOS DRM DP driver support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This enables support for DP device.