Revert "drm/amd/display: Setup for mmhubbub3_warmup_mcif with big buffer"

This reverts commit 428542d9.

[WHY & HOW]
The writeback series cause a regression in thunderbolt display.
Signed-off-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -8827,7 +8827,6 @@ static void dm_set_writeback(struct amdgpu_display_manager *dm,
 			      struct drm_connector_state *new_con_state)
 {
 	struct drm_writeback_connector *wb_conn = drm_connector_to_writeback(connector);
-	struct amdgpu_device *adev = dm->adev;
 	struct amdgpu_crtc *acrtc;
 	struct dc_writeback_info *wb_info;
 	struct pipe_ctx *pipe = NULL;
@@ -8903,11 +8902,6 @@ static void dm_set_writeback(struct amdgpu_display_manager *dm,
 	}
 
 	wb_info->mcif_buf_params.p_vmid = 1;
-	if (adev->ip_versions[DCE_HWIP][0] >= IP_VERSION(3, 0, 0)) {
-		wb_info->mcif_warmup_params.start_address.quad_part = afb->address;
-		wb_info->mcif_warmup_params.region_size =
-			wb_info->mcif_buf_params.luma_pitch * wb_info->dwb_params.dest_height;
-	}
 	wb_info->mcif_warmup_params.p_vmid = 1;
 	wb_info->writeback_source_plane = pipe->plane_state;