drm/amd/pm: correct the dpm features disablement for Navi1x

For BACO scenario, PMFW will handle the dpm features disablement
and interaction with RLC properly. Driver involvement is unnecessary
and error prone.

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