drm/amdgpu: add GDDR6 vram type

New vram type.
Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

include/uapi/drm/amdgpu_drm.h

@@ -912,6 +912,7 @@ struct drm_amdgpu_info_firmware {
 #define AMDGPU_VRAM_TYPE_HBM   6
 #define AMDGPU_VRAM_TYPE_DDR3  7
 #define AMDGPU_VRAM_TYPE_DDR4  8
+#define AMDGPU_VRAM_TYPE_GDDR6 9
 
 struct drm_amdgpu_info_device {
 	/** PCI Device ID */