drm/amdgpu: Add GDDR6 in vram_name arrary

For printing vram type.
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Tao Zhou <Tao.Zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_object.c

@@ -979,6 +979,7 @@ static const char *amdgpu_vram_names[] = {
 	"HBM",
 	"DDR3",
 	"DDR4",
+	"GDDR6",
 };
 
 /**