msm8960: Tune multicore power options

Change-Id: Ia8e7f26778de45774d7d92ed34c3dd49bcc7bcab
msm8960: Don't mess with the sampling/timer rate when screen off

 * Causes major audio derpage.

Change-Id: I49b8b6c412b3278be66d7e23be93ac1ba2fb3b23
power: Manage the notify_on_migrate setting

 * We don't want to do this with the screen off as it would cause higher
   power consumption.
 * Remove timer/sampling rate management.

Change-Id: I326b4fca13e58051fbbe2a5f55446654fff60d8d
Merge branch 'cm' into HEAD