drm/amdgpu: add VCN2.5 basic supports

i.e. basic VCN IP SW structures

VCN is the video codec block on the GPU.
Signed-off-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/Makefile

@@ -145,7 +145,8 @@ amdgpu-y += \
 amdgpu-y += \
 	amdgpu_vcn.o \
 	vcn_v1_0.o \
-	vcn_v2_0.o
+	vcn_v2_0.o \
+	vcn_v2_5.o
 
 # add ATHUB block
 amdgpu-y += \