DeviceSettings: Add UKSM toggle

Ever since UKSM replaced KSM in the kernel, KSM toggle has disappeared in Performance Settings due to it being non-existent.
Add UKSM toggle to those who like it.

I've made an effort to actually check whether it works by looking for any loopholes this time. :x

Misc: Also deleted a maybe unused line in manifest

Conflicts:
	DeviceSettings/res/values/strings.xml
	DeviceSettings/res/xml/advanced_preferences.xml
	DeviceSettings/src/com/cyanogenmod/settings/device/GeneralFragmentActivity.java
	DeviceSettings/src/com/teamcanjica/settings/device/DeviceSettings.java
	rootdir/init.samsungjanice.rc

Change-Id: I555a20bd803cb99a83ec17bb9f44426dda88b76a