Page faults can easily overwhelm the interrupt handler.

So to make sure that we never lose valuable interrupts on the primary ring
we re-route page faults to IH ring 1.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>