drm/amd/display: Loop through all pipes for DET allocation

[Why & How]
There are cases where the pipes populated are not all at the top
of the pipes list under context. Loop through all pipes for DET
allocation instead of just the number of populated ones, even if
some unpopulated pipes are iterated through unnecessarily.
Tested-by: NDaniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: NAlvin Lee <Alvin.Lee2@amd.com>
Acked-by: NAlan Liu <HaoPing.Liu@amd.com>
Signed-off-by: NTaimur Hassan <Syed.Hassan@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c

@@ -3068,7 +3068,7 @@ int dcn32_populate_dml_pipes_from_context(
 			}
 		}
 	} else
-		dcn32_determine_det_override(context, pipes, is_pipe_split_expected, pipe_cnt);
+		dcn32_determine_det_override(context, pipes, is_pipe_split_expected, dc->res_pool->pipe_count);
 
 	// In general cases we want to keep the dram clock change requirement
 	// (prefer configs that support MCLK switch). Only override to false