AMD dual core support for i386

Run HT initialization on AMD dual core CPUs on i386.  They fake being HT CPUs.
 This patch makes the HT detection run on AMD CPUs too.  I moved the HT
detection code into a common file from intel.c for that.

It would be actually better to run HT detection always on all CPUs but this
would need a second callback afterwards to AMD code, which I avoided for now.

It adds a cpuinfo->x86_num_cores field.

This sets up the phys_proc_id[] array.  This overloads this array with HT, but
when smp_num_siblings is 1

It is currently only used for /proc/cpuinfo printing.  The reason we want to
behave this like SMT is that there are some license managers in user space
that license according to number of physical CPUs, and when they handle HT
they should handle CMP with this hack too.  Another reason we need this is
that the powernow k8 driver needs this information to properly manage dual
core CPUs.  

When there are ever dual core HT CPUs this will need small changes in
smpboot.c.  I didn't do this for now to keep the patch simple.

Then we set smp_num_siblings to 1 on these systems again to prevent the
scheduler from setting up HT scheduling (which is not a very good match for
dual core). 

This is a port of the CMP support code from x86-64 (minus the NUMA bits)
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>