Adjust the way we number CPUs on x86 so that we attempt to "group" all

Adjust the way we number CPUs on x86 so that we attempt to "group" all
logical CPUs in a package.  We do this by numbering the non-boot CPUs
by starting with the first CPU whose APIC ID is after the boot CPU and
wrapping back around to APIC ID 0 if needed rather than always starting
at APIC ID 0.  While here, adjust the cpu_mp_announce() routine to list
CPUs based on the mapping established by assign_cpu_ids() rather than
making assumptions about the algorithm assign_cpu_ids() uses.

MFC after:	1 month