drm/amd/display: fix MALL size hardcoded for DCN321

[Why]
MALL size available can vary for different SKUs
MALL size was still hardcoded for DCN321

[How]
Remove hardcoding MALL size for DCN321
Reviewed-by: Alvin Lee <Alvin.Lee2@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Samson Tam <Samson.Tam@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/dcn321/dcn321_resource.c

@@ -1714,7 +1714,6 @@ static bool dcn321_resource_construct(
 		dc->caps.mall_size_per_mem_channel * 1024 * 1024;
 	dc->caps.mall_size_total = dc->caps.max_cab_allocation_bytes;
 
-	dc->caps.max_cab_allocation_bytes = 33554432; // 32MB = 1024 * 1024 * 32
 	dc->caps.subvp_fw_processing_delay_us = 15;
 	dc->caps.subvp_drr_max_vblank_margin_us = 40;
 	dc->caps.subvp_prefetch_end_to_mall_start_us = 15;