drm/amd/display: Fix POWERPC_64 compilation

[Why]
Compilation errors while compiling without CONFIG_DRM_AMD_DC_FP:
"undefined reference to `dc_bandwidth_in_kbps_from_timing'"

[How]
Fix Makefile to move dsc files out of DC_FP guard.

Fixes: 00c3911 ("drm/amd/display: Add misc DC changes for DCN401")
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Roman Li <Roman.Li@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/dsc/Makefile

@@ -29,11 +29,11 @@ DSC_DCN401 += dcn401_dsc.o
 
 AMD_DISPLAY_FILES += $(addprefix $(AMDDALPATH)/dc/dsc/dcn401/,$(DSC_DCN401))
 
+endif
 
 DSC = dc_dsc.o rc_calc.o rc_calc_dpi.o
 
 AMD_DAL_DSC = $(addprefix $(AMDDALPATH)/dc/dsc/,$(DSC))
 
 AMD_DISPLAY_FILES += $(AMD_DAL_DSC)
 
-endif