Revert "drm/amdgpu: align pp_power_profile_mode with kernel docs"

This reverts commit 8f614469.

This breaks some manual setting of the profile mode in
certain cases.

Closes: drm/amd#3600


Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 7a199557)
Cc: stable@vger.kernel.org