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

This reverts commit 4545ae2e

.

The origin patch "drm/amdgpu: getting fan speed pwm for vega10 properly" works fine.
Test failure is caused by test case self.

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>