drm/amdkfd: enable heavy-weight TLB flush on Arcturus

SDMA FW fixes the hang issue for adding heavy-weight TLB
flush on Arcturus, so we can enable it.

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