drm/amd/display: remove unused folder

dc/{dcn401,dcn303} are unused since the files in it got moved under their
respective new components location. Hence they are no longer necessary

Fixes: 2d62bb45 ("drm/amd/display: Refactor DCN3X into component folder")
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn303/Makefile

-# SPDX-License-Identifier: MIT
-#
-# Copyright (C) 2021 Advanced Micro Devices, Inc. All the rights reserved
-#
-#  Authors: AMD
-#
-# Makefile for dcn303.
-
-DCN3_03 = dcn303_init.o
-
-AMD_DAL_DCN3_03 = $(addprefix $(AMDDALPATH)/dc/dcn303/,$(DCN3_03))
-
-AMD_DISPLAY_FILES += $(AMD_DAL_DCN3_03)

drivers/gpu/drm/amd/display/dc/dcn401/Makefile

-# SPDX-License-Identifier: MIT
-# Copyright © 2024 Advanced Micro Devices, Inc. All rights reserved.
-
-DCN401 += dcn401_dio_link_encoder.o
-DCN401 += dcn401_dio_stream_encoder.o
-DCN401 += dcn401_mpc.o
-
-AMD_DAL_DCN401 = $(addprefix $(AMDDALPATH)/dc/dcn401/,$(DCN401))
-
-AMD_DISPLAY_FILES += $(AMD_DAL_DCN401)