ecore-drm2: Add background_color to crtc atomic properties

This patch adds a new field to the crtc atomic state which will be
used to support crtc background_color property, and also fills in that
state during crtc atomic state fill.

@feature

src/lib/ecore_drm2/ecore_drm2_device.c

@@ -268,7 +268,11 @@ _drm2_atomic_state_crtc_fill(Ecore_Drm2_Crtc_State *cstate, int fd)
              cstate->active.value = oprops->prop_values[i];
              DBG("\t\t\tValue: %d", cstate->active.value);
           }
-
+        else if (!strcmp(prop->name, "BACKGROUND_COLOR"))
+          {
+             cstate->background.id = prop->prop_id;
+             cstate->background.value = oprops->prop_values[i];
+          }
 cont:
         sym_drmModeFreeProperty(prop);
      }

src/lib/ecore_drm2/ecore_drm2_private.h

@@ -91,6 +91,7 @@ typedef struct _Ecore_Drm2_Crtc_State
    uint32_t obj_id;
    int index;
    Ecore_Drm2_Atomic_Property active;
+   Ecore_Drm2_Atomic_Property background;
    Ecore_Drm2_Atomic_Blob mode;
 } Ecore_Drm2_Crtc_State;