This reverts commit 13b40935.

This was a workaround for a bug in the HDA driver that prevented
the HDA audio chip from going into runtime pm which prevented
the GPU from going into runtime pm.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=106597


Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>