AP startup and AP resume (it was already used for BSP startup and BSP
resume).
- Split code to do one-time probing of cache properties out of
initializecpu() and into initializecpucache(). This is called once on
the BSP during boot.
- Move enable_sse() into initializecpu().
- Call initializecpu() for AP startup instead of enable_sse() and
manually frobbing MSR_EFER to enable PG_NX.
- Call initializecpu() when an AP resumes. In theory this will now
properly re-enable PG_NX in MSR_EFER when resuming a PAE kernel on
APs.
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