drm/amdgpu: apply nbio7 for Raven (v3)

nbio handles misc bus io operations. Handle
differences between different nbio bus versions.

v2: switch checks from RAVEN to APU (Alex)
    squash in raven rev id fetch
    squash in fix uninitalized hdp flush reg index for raven
v3: add some missed RAVEN to APU checks (Alex)

Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/soc15.h

@@ -25,6 +25,7 @@
 #define __SOC15_H__
 
 #include "nbio_v6_1.h"
+#include "nbio_v7_0.h"
 
 extern const struct amd_ip_funcs soc15_common_ip_funcs;