Add lockscreen rotation as an optional rotation setting (1/2)

This will allow the user to select wether or not to use the
rotation settings for the lockscreen.  This is dependent
upon the rotation setting being checked.

Forward port from cm-10.2, adjusted for 4.4

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: Ibd7c69b0af1e0a7d91b985f2b21ea0b5bc619a70
JIRA: CYAN-339

Patchset: 1
http://review.cyanogenmod.org/#/c/55016/

Conflicts:
	core/java/android/provider/Settings.java
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java