Revert "drm/amdkfd: SMI report dropped event count"

This reverts commit a3ab2d45b9.

The userspace side for this code is not ready yet so revert
for now.

Reviewed-by: Philip Yang <Philip.Yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Philip Yang <Philip.Yang@amd.com>

include/uapi/linux/kfd_ioctl.h

@@ -530,7 +530,6 @@ enum kfd_smi_event {
 	KFD_SMI_EVENT_QUEUE_EVICTION = 9,
 	KFD_SMI_EVENT_QUEUE_RESTORE = 10,
 	KFD_SMI_EVENT_UNMAP_FROM_GPU = 11,
-	KFD_SMI_EVENT_DROPPED_EVENT = 12,
 
 	/*
 	 * max event number, as a flag bit to get events from all processes,
@@ -611,7 +610,6 @@ struct kfd_ioctl_smi_events_args {
  *    rw: 'W' for write page fault, 'R' for read page fault
  *    rescheduled: 'R' if the queue restore failed and rescheduled to try again
  *    error_code: migrate failure error code, 0 if no error
- *    drop_count: how many events dropped when fifo is full
  */
 #define KFD_EVENT_FMT_UPDATE_GPU_RESET(reset_seq_num, reset_cause)\
 		"%x %s\n", (reset_seq_num), (reset_cause)
@@ -647,10 +645,6 @@ struct kfd_ioctl_smi_events_args {
 		"%lld -%d @%lx(%lx) %x %d\n", (ns), (pid), (addr), (size),\
 		(node), (unmap_trigger)
 
-#define KFD_EVENT_FMT_DROPPED_EVENT(ns, pid, drop_count)\
-		"%lld -%d %d\n", (ns), (pid), (drop_count)
-
-
 /**************************************************************************************************
  * CRIU IOCTLs (Checkpoint Restore In Userspace)
  *