Brings performance settings up-to-date with cm-10.2

Includes the following cm-10.2 commits:
http://review.cyanogenmod.org/30667 Performance: BootReceiver: set CPU min/max freqs before CPU governor
http://review.cyanogenmod.org/31886 Adding configurability of frequency cap (min/max) files' path.
http://review.cyanogenmod.org/48007 Cleanup: remove useless checks.
http://review.cyanogenmod.org/51295 Cleanup performance settings strings

Change-Id: If94d02745606e9bdca92a89ea7129a44878226a2
Settings : Port lockscreen shortcut configuration

Port lockscreen configuration from cm-10.2

Change-Id: Ib4fd41f747912cc741eca1983c5f56df56176aad
Add back navigation ring customization.

Patchset 6 : Hide nav bar category on devices without nav bar

Change-Id: Iec29417ab65efc8df593508204b0981d5b193b74
Add back navigation bar customization.

Change-Id: I6431a611f3107fd1022df11362d1d2aa27b2f436
Add back hardware key settings.

Change-Id: I925fd9d9c02b86d8e93c8b9e25870433f7c20bde