1. ABLE sets the l1pt to use domain 3 for it's entries (no idea why) so to
cover all bases when setting the domain before the change to the new L1pt
become a client of all domains.
2. It seems that we setup the kernel entries without any access permission.
(note not sure that this isn't a bug) And rely on the control bits
containing either ROM or SYST enable. which allows access to pages without
access permissions set. We actually enable SYST when we do the full detect
of the CPU, but we don't detect the CPU till after the L1pt switch, which
we never make it past. Fix this by explicitly enabling the SYST bit in the
control register. rather than relying on the firmware to have dont the right
thing.