drm/amdgpu: add lock option for smu_set_soft_freq_range()

Add lock_needed param for smu_set_soft_freq_range()

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