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.

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

Change-Id: Ibd7c69b0af1e0a7d91b985f2b21ea0b5bc619a70
JIRA: CYAN-339

Conflicts:

	core/java/android/provider/Settings.java
policy/KeyguardViewManager.java: import android.provider.Settings