disp: msm: sde: remove unused variable topology from sde_encoder

Topology in sde_encoder is no longer used, so remove this
variable from sde_encoder.

Change-Id: Iba02ae690d81d39252d0df83882a72e35f2916ec
Signed-off-by: Lei Chen <chenlei@codeaurora.org>

msm/sde/sde_encoder.h

@@ -228,7 +228,6 @@ struct sde_encoder_virt {
 	struct kthread_work input_event_work;
 	struct kthread_work esd_trigger_work;
 	struct input_handler *input_handler;
-	struct msm_display_topology topology;
 	bool vblank_enabled;
 	bool idle_pc_restore;
 	enum frame_trigger_mode_type frame_trigger_mode;