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_kms.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>
  *
@@ -232,6 +232,16 @@ struct sde_irq {
 	struct dentry *debugfs_file;
 };
 
+/**
+ * struct sde_kms_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_kms_frame_event_cb_data {
+	struct drm_crtc *crtc;
+	struct drm_connector *connector;
+};
+
 struct sde_kms {
 	struct msm_kms base;
 	struct drm_device *dev;