SMP support for n64 patch.

[Jayachandran C.]

I've attached a patch that enables SMP support for N64 builds (I can
get XLR come up multi-user with 32 cpus with this).

I ended up making KX bit in status register set when you are in
userspace, since the PCPU area is now mapped in XKSEG.  The PCPU area
needs to be accessed in  I have reverted the earlier change that
enabled KX on kernel entry from userspace since that is no longer
needed.

Please let me know your comments.

JC.
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