drm/amdgpu: Add APU support in vi_set_vce_clocks

1. fix set vce clocks failed on Cz/St
   which lead 1s delay when boot up.
2. remove the workaround in vce_v3_0.c

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Shirish S <shirish.s@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org