Revert "drm/amdgpu/swsmu: drop set_fan_speed_percent (v2)"

Revert "drm/amdgpu/swsmu: drop set_fan_speed_percent (v2)"

commit a119f87b86bcdf14a18ce39a899e97a1e9160f7f upstream.

On some boards the rpm interface apparently does not work at all
leading to the fan not spinning or spinning at strange speeds.
Revert this for now to fix 5.10, 5.11.  The follow on patch
fixes this properly for 5.12.

This reverts commit 8d6e65adc25e23fabbc5293b6cd320195c708dca.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1408
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>