drm/amd/powerplay: put setting hard limit common code in smu_v11_0.c

As designed the common code shared among all smu v11 ASCIs go to
smu_v11_0.c. This helps to maintain clear code layers.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>