drm/amd/powerplay: remove SRIOV check in SMU11 (v2)

We don't need SRIOV check after we enable SMC msg filter in SMU11

v2: squash in unused variable fix, unused ids

Signed-off-by: Wenhui Sheng <Wenhui.Sheng@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>