Fix build issue for Exynos build target
Fix build issue for Exynos build target

There is a missing header file that is requried in drmmode_exynos.c
to build the armsoc for Exynos. This includes the missing file.

Change-Id: Icc2de0ce0673d017281f38db6714b816ba8f44fd

singulared/xf86-video-armsoc,Popolon/xf86-video-armsoc,OtherCrashOverride/armsoc-hardkernel,singulared/xf86-video-armsoc,mdrjr/xf86-video-armsoc,mmind/xf86-video-armsoc,freedesktop-unofficial-mirror/xorg__driver__xf86-video-armsoc,Popolon/xf86-video-armsoc,apxii/xf86-video-armsoc,freedesktop-unofficial-mirror/xorg__driver__xf86-video-armsoc,OtherCrashOverride/armsoc-hardkernel,xin3liang/xf86-video-armsoc,sbambrough/xf86-video-armsoc,xin3liang/xf86-video-armsoc,mmind/xf86-video-armsoc,commshare/xf86-video-armsoc,apxii/xf86-video-armsoc,mdrjr/xf86-video-armsoc,commshare/xf86-video-armsoc,sbambrough/xf86-video-armsoc