drm/gma500: Unify encoder mode fixup

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>

drivers/gpu/drm/gma500/gma_display.c

@@ -485,6 +485,13 @@ int gma_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
 	return 0;
 }
 
+bool gma_encoder_mode_fixup(struct drm_encoder *encoder,
+			    const struct drm_display_mode *mode,
+			    struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
 bool gma_crtc_mode_fixup(struct drm_crtc *crtc,
 			 const struct drm_display_mode *mode,
 			 struct drm_display_mode *adjusted_mode)