Revert "drm/amdkfd: Only apply TLB flush optimization on ALdebaran"

This reverts commit 51627f03.

Reason for revert: it causes regression on Aldebaran.

Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>