drm/amd/display: increase MAX_SURFACES to the value supported by hw

As the hw supports up to 4 surfaces, increase the maximum number of
surfaces to prevent the DC error when trying to use more than three
planes.

[drm:dc_state_add_plane [amdgpu]] *ERROR* Surface: can not attach plane_state 000000003e2cb82c! Maximum is: 3

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/3693
Signed-off-by: Melissa Wen <[email protected]>
Reviewed-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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

@@ -57,7 +57,7 @@ struct dmub_notification;
 
 #define DC_VER "3.2.314"
 
-#define MAX_SURFACES 3
+#define MAX_SURFACES 4
 #define MAX_PLANES 6
 #define MAX_STREAMS 6
 #define MIN_VIEWPORT_SIZE 12