d2: Disable standalone power collapse

 * This is causing Krait watchdog timeouts. Other Krait devices such as
   Mako experience the same failure.
 * Disable it (same as stock) to stop the crashes and allow me to sleep again.

Change-Id: I2db4525b4271b5d762a537bc785f3344e5fa9be2
Merge remote-tracking branch 'cm/cm-10.1' into jb_2.5