drm/amdgpu: Revert "drm/amdgpu: getting fan speed pwm for vega10 properly"

drm/amdgpu: Revert "drm/amdgpu: getting fan speed pwm for vega10 properly"

[ Upstream commit 8019017bbe77ed299fe938d5a9eda4c2e4b643bd ]

This reverts commit 69b76f5313ab092ed9dfbc30b3efbd7c9c4c7f58.

Unfortunately, that commit causes fan monitors can't be read and written
properly.

Fixes: 69b76f5313ab09 ("drm/amdgpu: getting fan speed pwm for vega10 properly")
Signed-off-by: Asher Song <Asher.Song@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>