drm/amd/powerplay: add smu11_driver_if.h (v4)

v2: cleanup
v3: fit the latest 40.6 smc fw
v4: update to latest.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>