Minor fixup for the MIPS SMP platform code.

[C. Jayachandran]

The attached patch (also at http://sites.google.com/site/cjayachandran/files)
has two changes:
- moves the intr masking code to platform_init_ap, so that we can avoid the
#ifdef for XLR
- adds a platform_smp_topo() function so that platforms can define their
topology

I've also attempted to fixup sys/mips/sibyte to reflect these changes, but
it might need further work.
sys/mips/cavium also might need similar changes for SMP.

Please review and apply if the changes are okay.

Thanks,
JC.
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