drm/amd/display: Stop waiting for vblank during pipe programming

[why and how]
This line was originally removed for a compliance issue, but then
reverted as it caused a fringe underflow case.

However, the addition of this line caused a underflow regression
when subVP is on, and it needs to be removed again. We plan to
fix subvp underflow and then re-add in this line. After that,
we will investigate what to do next for the compliance issue.
Reviewed-by: NAlvin Lee <Alvin.Lee2@amd.com>
Acked-by: NAlex Hung <alex.hung@amd.com>
Signed-off-by: NMartin Leung <Martin.Leung@amd.com>
Tested-by: NMark Broadworth <mark.broadworth@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

@@ -1663,7 +1663,6 @@ static void dcn20_program_pipe(
 				pipe_ctx->pipe_dlg_param.vupdate_width);
 
 		if (pipe_ctx->stream->mall_stream_config.type != SUBVP_PHANTOM) {
-			pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VBLANK);
 			pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VACTIVE);
 		}