disp: msm: sde: move dsc implementation to a new file

This change moves the DSC implementation into a separate file.
This is required to add support for new compression algorithms.
This cleanup change also, moves struct sde_encoder_virt
declaration to the encoder header file.

Change-Id: Idc3b96e65fcce2a7ee6e17af604cec0cb574f6f7
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>

msm/sde/sde_crtc.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2019 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015-2020 The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
  *
@@ -99,16 +99,6 @@ struct sde_crtc_mixer {
 	u32 mixer_op_mode;
 };
 
-/**
- * struct sde_crtc_frame_event_cb_data : info of drm objects of a frame event
- * @crtc:       pointer to drm crtc object registered for frame event
- * @connector:  pointer to drm connector which is source of frame event
- */
-struct sde_crtc_frame_event_cb_data {
-	struct drm_crtc *crtc;
-	struct drm_connector *connector;
-};
-
 /**
  * struct sde_crtc_frame_event: stores crtc frame event for crtc processing
  * @work:	base work structure