drm/amd/powerplay: add STABLE_PSTATE_SCLK and STABLE_PSTATE_MCLK when read sensor for SMU11

add AMDGPU_PP_SENSOR_STABLE_PSTATE_SCLK and
AMDGPU_PP_SENSOR_STABLE_PSTATE_MCLK to support
read sensor for SMU11.

Signed-off-by: Chengming Gui <Jack.Gui@amd.com>
Reviewed-by: Kevin Wang <kevink1.wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>