From: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>

This patch changes the idle time accounting in ondemand governor.
With this patch ondemand governor accounts cpu iowait time as idle time.

Thanks to Stefan Seyfried for identifying this issue.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>