drm/amdgpu/: increase AMDGPU_MAX_RINGS to add 2nd vcn instance

increase AMDGPU_MAX_RINGS to add 2nd vcn instance
Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h

@@ -29,7 +29,7 @@
 #include <drm/drm_print.h>
 
 /* max number of rings */
-#define AMDGPU_MAX_RINGS		24
+#define AMDGPU_MAX_RINGS		28
 #define AMDGPU_MAX_GFX_RINGS		2
 #define AMDGPU_MAX_COMPUTE_RINGS	8
 #define AMDGPU_MAX_VCE_RINGS		3