drm/amd/display: un-block 8k with single dimm

[Why]
Driver doesn't validate multi-display with scaling when OS calls DDI.
This behavior causes the validated result to be a mismatch
between some automated test cases.
To address this issue, some workaround was added that caused issues in 8k.

[How]
Since the origin issue had been root caused,
revert the previous workaround and unblock 8k with a single dimm.
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Paul Hsieh <paul.hsieh@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/resource/dcn314/dcn314_resource.c

@@ -1695,25 +1695,6 @@ static void dcn314_get_panel_config_defaults(struct dc_panel_config *panel_confi
 	*panel_config = panel_config_defaults;
 }
 
-static bool filter_modes_for_single_channel_workaround(struct dc *dc,
-		struct dc_state *context)
-{
-	// Filter 2K@240Hz+8K@24fps above combination timing if memory only has single dimm LPDDR
-	if (dc->clk_mgr->bw_params->vram_type == 34 &&
-	    dc->clk_mgr->bw_params->num_channels < 2 &&
-	    context->stream_count > 1) {
-		int total_phy_pix_clk = 0;
-
-		for (int i = 0; i < context->stream_count; i++)
-			if (context->res_ctx.pipe_ctx[i].stream)
-				total_phy_pix_clk += context->res_ctx.pipe_ctx[i].stream->phy_pix_clk;
-
-		if (total_phy_pix_clk >= (1148928+826260)) //2K@240Hz+8K@24fps
-			return true;
-	}
-	return false;
-}
-
 bool dcn314_validate_bandwidth(struct dc *dc,
 		struct dc_state *context,
 		bool fast_validate)
@@ -1732,9 +1713,6 @@ bool dcn314_validate_bandwidth(struct dc *dc,
 	if (!pipes)
 		goto validate_fail;
 
-	if (filter_modes_for_single_channel_workaround(dc, context))
-		goto validate_fail;
-
 	DC_FP_START();
 	// do not support self refresh only
 	out = dcn30_internal_validate_bw(dc, context, pipes, &pipe_cnt, &vlevel, fast_validate, false);