disp: msm: sde: remove vblank cache logic

Userspace is not supposed to request vblank until crtc is enabled,
because drm framework rejects the request if crtc is not enabled.
Any vblank request prior to that need to be cached in the userspace.
Hence removing the cache logic from the downstream driver.

Change-Id: I5383e39075377e3e49b8d335598ddfa48ab54666
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>

msm/sde/sde_crtc.h

@@ -224,7 +224,6 @@ struct sde_crtc_misr_info {
  * @vblank_last_cb_time  : ktime at last vblank notification
  * @sysfs_dev  : sysfs device node for crtc
  * @vsync_event_sf : vsync event notifier sysfs device
- * @vblank_requested : whether the user has requested vblank events
  * @suspend         : whether or not a suspend operation is in progress
  * @enabled       : whether the SDE CRTC is currently enabled. updated in the
  *                  commit-thread, not state-swap time which is earlier, so
@@ -294,7 +293,6 @@ struct sde_crtc {
 	struct sde_crtc_fps_info fps_info;
 	struct device *sysfs_dev;
 	struct kernfs_node *vsync_event_sf;
-	bool vblank_requested;
 	bool suspend;
 	bool enabled;