drm/amd/dc: remove duplicate include

'dm_services.h' included in 'freesync,c' is duplicated, so remove one.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/modules/freesync/freesync.c

@@ -29,7 +29,6 @@
 #include "dc.h"
 #include "mod_freesync.h"
 #include "core_types.h"
-#include "dm_services.h"
 
 #define MOD_FREESYNC_MAX_CONCURRENT_STREAMS  32