[1/2] Add lockscreen rotation as an optional rotation setting

Taken fom:

https://github.com/gokussjx/cm_packages_apps_Settings/commit/a83ae47e184a778ca3067416c56901da70c1bc27

PS7
fixed value handling
PS8
Fix option doesn't stick

Change-Id: I3fd1d2c31d83230d480a0027cb7bf5fcf2db5cb7
merge changes from Omni 4.4 into local branch

Conflicts:
	res/values/custom_strings.xml

Change-Id: If08e3708750fa7be46ea70b69796c5213c3cf51f