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

This reverts commit 53d05330.

Revert reason: The issue has been resolved.

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