drm/amd/display: Refactoring MMHUBBUB

[Why]
To refactor MMHUBBUB files

[How]
Moved mmhubbub files from dcn20 to /mmhubbub/ folder and
update makefile to fix compilation.

Reviewed-by: Martin Leung <[e-mail]>
Signed-off-by: Jerry Zuo <[e-mail]>
Signed-off-by: Revalla Hari Krishna <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/dcn20/Makefile

···
 # SPDX-License-Identifier: MIT
 # Copyright © 2019-2024 Advanced Micro Devices, Inc. All rights reserved.
 
-DCN20 = dcn20_mpc.o dcn20_mmhubbub.o \
+DCN20 = dcn20_mpc.o \
 		dcn20_vmid.o dcn20_dwb.o dcn20_dwb_scl.o
 
 AMD_DAL_DCN20 = $(addprefix $(AMDDALPATH)/dc/dcn20/,$(DCN20))

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

···
 
 ifdef CONFIG_DRM_AMD_DC_FP
 ###############################################################################
+# DCN20
+###############################################################################
+MMHUBBUB_DCN20 = dcn20_mmhubbub.o
+
+AMD_DAL_MMHUBBUB_DCN20 = $(addprefix $(AMDDALPATH)/dc/mmhubbub/dcn20/,$(MMHUBBUB_DCN20))
+
+AMD_DISPLAY_FILES += $(AMD_DAL_MMHUBBUB_DCN20)
+
+###############################################################################
 # DCN32
 ###############################################################################
 MMHUBBUB_DCN32 = dcn32_mmhubbub.o