[PATCH] x86-64/i386: Revert cpuinfo siblings behaviour back to 2.6.10

[PATCH] x86-64/i386: Revert cpuinfo siblings behaviour back to 2.6.10

Only display physical id/siblings when there are siblings or dual core.

In 2.6.11 I accidentially broke it and it was always displaying these
fields But for compatibility to all these /proc parsers around it is better
to do it in the old way again.

Noticed by Suresh Siddha

Cc: <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>