drm/amdgpu: add initial vcn support and decode tests

VCN is the new media block on Raven. Add core support
and the ring and ib tests for decode.

Signed-off-by: Leo Liu <leo.liu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/Makefile

@@ -93,6 +93,10 @@ amdgpu-y += \
 	vce_v3_0.o \
 	vce_v4_0.o
 
+# add VCN block
+amdgpu-y += \
+	amdgpu_vcn.o
+
 # add amdkfd interfaces
 amdgpu-y += \
 	 amdgpu_amdkfd.o \