Support BSP offline for IA64.

Hi Tony,

This set of patches support offlining a BSP in ia64.

- Chooses different time master instead of
relying on BSP for tsc sync.
- Recognizes CPEI override option for IA64 via APCI.
- New command line to help test these patches, and turn em on via cmd line switches.

Cheers,
Ashok Raj