cpuidle: governor: menu: don't use loadavg

get_loadavg doesn't work as intended.  According to the comments, it
should be returning an average over a few seconds, but it is actually
reading the instantaneous load.  It is almost always returning 0, but
can sometimes, depending on workload, spike very high into the hundreds
even when the average cpu load is under 10%.  Disable it for now.

Change-Id: I63ed100af1cf9463549939b8113ed83676db5f86
Signed-off-by: Colin Cross <ccross@android.com>
cpuidle: menu: Remove the unused get_loadavg function

The fuction get_loadavg was unused and this also caused
a warning during build. This change also removes it from
the allowed warnings white-list.

Change-Id: I85b184e1eb0ab8b3cf763cab87a30e140d00332b
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>