drm/amdgpu: clean the dummy wait_for_idle functions
Remove the dummy wait_for_idle functions for all
ip blocks.
Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
authored by