drm/amd/display: Fix warning. Set MAX_SURFACES to 3

Currently we never use more than 2 surfaces in all use cases.
This avoids pushing dc_commit_surfaces_to_target beyond a
stacksize of 1024.

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@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

@@ -34,7 +34,7 @@
 #include "link_service_types.h"
 
 #define MAX_TARGETS 6
-#define MAX_SURFACES 6
+#define MAX_SURFACES 3
 #define MAX_SINKS_PER_LINK 4
 
 /*******************************************************************************