drm/amd/display: Fix FBC compilation

- Fixing compilation with ENABLE_FBC flag
  which was broken after flattening core_dc to dc

Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Jerry Zuo <Jerry.Zuo@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc.h

@@ -35,6 +35,7 @@
 #include <inc/hw/opp.h>
 
 #include "inc/hw_sequencer.h"
+#include "inc/compressor.h"
 #include "dml/display_mode_lib.h"