TF700T: Convert AutoParts to be a fragment activity

This change does:

* Convert Autoparts activity to a fragment activity (the common preference activity in jb and up)
* Remove unused SettingsActivity and preferences.xml
* Add to DeviceSettings LTO logic
* Change default cpu mode to Performance (http://review.cyanogenmod.org/#/c/30522/)
* Clean up unused imports
* Add a notification to status bar while downloading.
* Add common device setting launcher icon to application in manifest

Patchset 2:
   * Add "Set on boot" preference (CPU)
   * Revert default cpu to Balanced
   * Extra logging on boot

Patchset 3:
   * Use HOME_UP button
   * Fix copyright headers

Change-Id: I3a9112780081a2e1c01189dd4d2464bf93443f68
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Merge "TF700T: Convert AutoParts to be a fragment activity" into cm-10.1