drm/amd/display: Cleanup dml2 and dc/resource Makefile

Remove some useless lines from DC Makefiles.
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@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/dml2/Makefile

@@ -35,8 +35,6 @@ frame_warn_flag := -Wframe-larger-than=2048
 endif
 endif
 
-# DRIVER_BUILD is mostly used in DML2.1 source
-subdir-ccflags-y += -DDRIVER_BUILD=1
 subdir-ccflags-y += -I$(FULL_AMD_DISPLAY_PATH)/dc/dml2
 subdir-ccflags-y += -I$(FULL_AMD_DISPLAY_PATH)/dc/dml2/dml21/src/dml2_core
 subdir-ccflags-y += -I$(FULL_AMD_DISPLAY_PATH)/dc/dml2/dml21/src/dml2_mcg/

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

@@ -198,8 +198,6 @@ AMD_DISPLAY_FILES += $(AMD_DAL_RESOURCE_DCN351)
 
 ###############################################################################
 
-###############################################################################
-
 RESOURCE_DCN401 = dcn401_resource.o
 
 AMD_DAL_RESOURCE_DCN401 = $(addprefix $(AMDDALPATH)/dc/resource/dcn401/,$(RESOURCE_DCN401))