Preparation for i386 Meltdown fix:

- provide a cpu_softc for cpu_attach() etc.
- replace per PCB TSS with per CPU TSS

The first change prepares for cpu_info being embedded in a
cpu_full_info.  Therefore during autoconf/cpu_attach we hand down
a softc.

The second change removes the per PCB TSS.  We now have one TSS per
CPU, thus in cpu_switchto() we only have to patch the ring 0 stack
pointer instead of loading a new TSS.  This also allows for cleaning
up the GDT, so we only have a single slot for the TSS.

from hshoexer@;  OK deraadt@

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