drm/amdgpu: add RAVEN family id definition

RAVEN is a new APU.

Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h
index 1d1ac1e..40486c7 100644
--- a/drivers/gpu/drm/amd/include/amd_shared.h
+++ b/drivers/gpu/drm/amd/include/amd_shared.h
@@ -48,6 +48,7 @@ enum amd_asic_type {
 	CHIP_POLARIS11,
 	CHIP_POLARIS12,
 	CHIP_VEGA10,
+	CHIP_RAVEN,
 	CHIP_LAST,
 };