drm/amd/display: Drop CONFIG_DRM_AMD_DC_DMUB guards

[Why]
Support for DMUB only depends on support for DC. It doesn't use floating
point so we don't need to guard it by any specific DCN revision.

[How]
Drop the guards and cleanup the newlines around each one.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dmub/src/Makefile

@@ -20,10 +20,8 @@
 # OTHER DEALINGS IN THE SOFTWARE.
 #
 
-ifdef CONFIG_DRM_AMD_DC_DMUB
 DMUB = dmub_srv.o dmub_reg.o dmub_dcn20.o dmub_dcn21.o
 
 AMD_DAL_DMUB = $(addprefix $(AMDDALPATH)/dmub/src/,$(DMUB))
 
 AMD_DISPLAY_FILES += $(AMD_DAL_DMUB)
-endif