Make drm device configurable with WLC_DRM_DEVICE variable.
Make drm device configurable with WLC_DRM_DEVICE variable.

lkundrak/wlc,ss1h2a3tw/wlc,vially/wlc,lkundrak/wlc,Earnestly/wlc,gpyh/wlc,SirCmpwn/wlc,gpyh/wlc,Enerccio/ewlc,yohanesu75/wlc,scarabeusiv/wlc,Cloudef/wlc,Earnestly/wlc,yohanesu75/wlc,UIKit0/wlc,vially/wlc,scarabeusiv/wlc,ammen99/wlc,UIKit0/wlc,SirCmpwn/wlc,ammen99/wlc,Cloudef/wlc,Enerccio/ewlc,ss1h2a3tw/wlc