commit f1d2a26b upstream.

Seems to make VM flushes more stable on SI and CIK.

v2: only use the PFP on the GFX ring on CIK
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>