drm/amd/display: Acquire DSC during split stream for ODM only if top_pipe

[WHY]
DSC should only be acquired per OPP. Therefore, DSC should only
be acquired for the top_pipe when ODM is enabled.
Not doing this check may lead to acquiring more DSC's than needed
when doing MPO + ODM Combine.

[HOW]
Only acquire DSC if pipe is top_pipe.
Signed-off-by: Sung Lee <sung.lee@amd.com>
Acked-by: Bindu Ramamurthy <bindu.r@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

@@ -1933,7 +1933,7 @@ bool dcn20_split_stream_for_odm(
 		next_odm_pipe->stream_res.opp = pool->opps[next_odm_pipe->pipe_idx];
 	else
 		next_odm_pipe->stream_res.opp = next_odm_pipe->top_pipe->stream_res.opp;
-	if (next_odm_pipe->stream->timing.flags.DSC == 1) {
+	if (next_odm_pipe->stream->timing.flags.DSC == 1 && !next_odm_pipe->top_pipe) {
 		dcn20_acquire_dsc(dc, res_ctx, &next_odm_pipe->stream_res.dsc, next_odm_pipe->pipe_idx);
 		ASSERT(next_odm_pipe->stream_res.dsc);
 		if (next_odm_pipe->stream_res.dsc == NULL)